Abstract:
A chassis for a vehicular trailer, comprising a generally flat wheel engaging segment, said wheel engaging rotatably attached to a pair of collinearly disposed wheels; a hitch engaging segment connected to a trailer hitch and a linking segment, said linking segment disposed between and connecting the wheel engaging segment and the hitch engaging segment and comprising a change in height adapted to cause the hitch engaging segment to be offset from the wheel engaging segment relative to a support surface.

Description:
BACKGROUND 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to frames or chassis and, more particularly, to trailer chassis adapted to meet the needs of disabled users or other applications where accessibility to the interior of an enclosed trailer or top of deck of an open trailer is improved by having a lower point of access when not in transport mode. 
         [0003]    2. Description of the Related Art 
         [0004]    The present disclosure is directed to a trailer for transportation over a support surface such as a road. The trailer apparatus of the present invention is adapted to provide a trailer with significantly improved access in a deployed/standing (non-transport) position suitable for access by disabled users, preferably in compliance with the Americans with Disabilities Act (“ADA”) or other applications where accessibility to the interior of an enclosed trailer or top of deck of an open trailer is improved by having a lower point of access when not in transport mode and a suitable transport position relative to ground clearances and typical industry “bumper pull” hitch connection heights of 15-25″ found in vehicles with towing capacities less than 20,000#. 
         [0005]    Trailers are adapted to be attached to a vehicle typically by ball hitch, pintle hitch or 5 th  wheel hitch for movement over a support surface from a first location to a desired second location. Trailers typically include a frame that is adapted to be removably attached to the vehicle when not in transport mode. The frame supports a floor and one or more axles are attached to the frame, with each axle having one or more rotatable wheels. The frame also often supports an enclosure that forms a useable interior space above the floor and that is typically accessible through one or more doors in the enclosure. The interior space within the enclosure may be used for various purposes, including the receipt and storage of goods for transport, commercial vending, bathroom facilities for use by individuals, or various types of work space or living space for use by individuals. When the interior space is adapted for use by individuals, it has been found advantageous to be able to lower the frame and thereby the floor of the trailer from a raised transport position to a lowered stationary position, wherein the floor and frame are lowered with respect to the wheels of the trailer and the support surface on which the trailer is located. Movement by an individual between the exterior of the trailer enclosure and the interior space of the trailer enclosure is simplified when the frame is in the lowered stationary position due to the lowered height of the frame and floor with respect to the support surface. The ability to lower the frame and floor of the trailer with respect to the wheels and thereby the support surface enables the trailer to more practically meet access, requirements as established by the Americans with Disabilities Act (“ADA”). The frame also often supports an open deck for transport of payload that may be advantageous to load in a position that is lowered. Unfortunately, prior art trailers, as shown below, often fail to provide access to disabled persons or only do so by using complex suspension systems. 
         [0006]    U.S. Pat. No. 775,529 discloses an independent adjustable axle suspension system for mounting a wheel to a frame of a trailer for transport of the trailer over a support surface. The axle suspension system includes a tower adapted to be attached to the frame and an axle unit adapted to receive the wheel. The tower is selectively moveable with respect to the axle unit along guide assemblies between extended and retracted positions to thereby selectively position the height of the frame with respect to the support surface. 
         [0007]    U.S. Pat. No. 7,926,618 discloses a portable wheel chair lift device includes a lift car, a support base, and a lifting mechanism coupled thereto to selectively raise or lower the lift car while allowing the floor of the lift car to be fully-lowered to the ground surface. A scissors-like brace selectively locks the front door of the lift car to the support base when the lift car is elevated. The lift car floor can be folded and collapsed to a reduced width allowing transport through narrow. Transport casters are removably mounted to the bottom of the lift car to facilitate transport. The lift device includes a height adjustment control within the lift car to repeatedly raise the lift car to the height of a stage. 
         [0008]    U.S. Pat. No. 7,950,678 discloses a trailer leveling system for adjusting a height of a frame of a trailer above a ground surface is disclosed. The trailer leveling system comprises at least one trailer leveling apparatus configured to adjust a distance between an axle of the trailer and the frame of the trailer. The at least one trailer leveling apparatus acts on a suspension of the trailer. The at least one trailer leveling apparatus moving the suspension between a traveling position and a leveling position, with the traveling position being characterized by the suspension being capable of supporting the frame during movement of the trailer along a road and the leveling position being characterized by a portion of the suspension being moved away from the frame with respect to the travel position. 
         [0009]    U.S. Pat. No. 8,087,559 discloses a loading apparatus for allowing wheelchair access to a vehicle. The apparatus attaches to the hitch receiver of the vehicle, such as a van, truck or similar vehicle. The apparatus includes three ramp section pivotally connected such that the apparatus does not obstruct vision through the rear of the vehicle but also provides sufficient ground clearance for operation of the vehicle. 
         [0010]    U.S. Pat. No. 8,113,526 discloses a suspension system having linearly translating load-bearing or load support members that confine displacement of a weight-bearing body or member to a longitudinal axis or displacement axis rather than a lateral axis or not coincident with the longitudinal axis, comprising a rail and bridge assembly. The linear bearing assembly can comprise a rail and a bridge slidably movable along the longitudinal axis of the rail. 
         [0011]    U.S. Pat. No. 8,739,935 discloses a portable wheel chair lift device having a lift car, a support base, and a lifting mechanism coupled thereto to selectively raise or lower the lift car while allowing the floor of the lift car to be fully-lowered to the ground surface. The lift car floor can be folded and collapsed to a reduced width allowing transport through narrow passages. Transport casters are removably mounted to the bottom of the lift car to facilitate transport. The lift device includes a height adjustment control within the lift car to repeatedly raise the lift car to the height of a stage. 
         [0012]    U.S. Pat. No. 8,919,049 discloses a prefabricated, transportable, ADA compliant, temporary addition, providing ADA accessible bathing, hygiene, and optional laundry facilities to the disabled occupants, eliminating the need to negotiate stairs to access a second floor bath or basement laundry. The addition is designed to be transported, lifted, connected and disconnected multiple times. The addition contains a walk-in shower with grab bars, ADA sink and sink base, tilt mirror, raised toilet with grab bars, egress door, light, heating unit, and exhaust fan. The addition is supported on a foundation of piers and attached to a ground floor room of an existing home by way of a connecting collar, minimizing the surface area connection to the house. The addition is pre-plumbed and wired with plumbing and electrical access points at the base of the addition that are connected to the existing home&#39;s utilities through a hole into the basement. 
         [0013]    U.S. Pat. No. 8,925,934 discloses a torsion slide suspension has a pair of polyethylene slides on each side of the suspension that is received in slide channels on a trailer frame. The torsion slide suspension has a rubber spring on top for bearing against the trailer frame and provides suspension to support the wheels of a ground level loading trailer. 
         [0014]    U.S. patent application publication no. 20150102568 discloses an assembly for supporting a vehicle chassis on a wheel of the vehicle includes a wheel attachment component for attaching the assembly to the wheel, a chassis attachment component for attaching the assembly to the vehicle chassis, and a suspension component. At least one adjustment element is coupled with the chassis attachment component and with a first portion of the suspension component, and is configured to shift the first portion of the suspension element between a plurality of operating positions relative to the chassis attachment component. A single strut bar is rigidly coupled with the wheel attachment component and with a second portion of the suspension component, and is configured to pivot relative to the chassis attachment component. The suspension component is configured to regulate motion transfer between the wheel attachment component and the chassis attachment component. 
         [0015]    What is needed in the art is a vehicle trailer apparatus adapted for convenient access by persons with disabilities without the need for a complex suspension system. 
       SUMMARY 
       [0016]    The present invention is adapted to provide for improved access to the inside of an enclosed trailer or on to the deck of a non-enclosed trailer especially for individuals have poor physical mobility or other applications where it is advantageous to have lowered access to the interior of an enclosed trailer or the deck of a non-enclosed trailer. Prior art trailers provide such access, if at all, only by lowering some or all of the trailer suspension using a hydraulically, mechanically, or electrically powered jacking device. The apparatus of the present invention utilized a design of the frame/chassis to provide access while the trailer is resting and a transport mode without any such jacking device. 
         [0017]    In one exemplary embodiment, the present invention comprises a chassis for a vehicular trailer, said chassis comprising: a pair of first and second parallel rails, each of said rails comprising a generally flat wheel engaging segment, said wheel engaging segment having a height, a generally flat hitch engaging segment, said hitch engaging segment having a height, and a linking segment, said linking segment disposed between and connecting said wheel engaging segment and said hitch engaging segment, said linking segment comprising a change in height adapted to cause said hitch engaging segment height to be offset from said wheel engaging segment height relative to a support surface; a rear cross member, said rear cross member disposed between and perpendicularly to said rails, said rear cross member having a first end fixedly connected to said wheel engaging segment of said first rail and a second end fixedly connected to said wheel engaging segment of said second rail; a front cross member, said front cross member disposed between and perpendicularly to said rails, said front cross member having a first end fixedly connected to said hitch engaging segment of said first rail and a second end fixedly connected to said hitch engaging segment of said second rail; a trailer hitch, said hitch fixedly connected to said connected to said chassis at said front cross member; and a pair of first and second wheels, where said first wheel has an axis of rotation and said first wheel is rotatably attached to said wheel engaging segment of said first rail, and where said second wheel has an axis of rotation and said second wheel is rotatably attached to said wheel engaging segment of said second rail, and where said axis of rotation of said first wheel is collinear with said axis of rotation of said second wheel. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0018]    The present invention will be understood more fully from the detailed description given hereinafter and from the accompanying drawings of the preferred embodiment of the present invention, which, however, should not be taken to limit the invention, but are for explanation and understanding only. 
           [0019]    In the drawings: 
           [0020]      FIG. 1  shows a side assembly view of an exemplary apparatus in accordance with the present invention in a “set” and a “transport” position. 
           [0021]      FIG. 2  shows a side assembly view of an exemplary apparatus in accordance with the present invention in the set position. 
           [0022]      FIG. 3  shows a top view of the chassis of  FIG. 1 . 
           [0023]      FIG. 4  shows a top perspective view of the chassis in  FIG. 1 . 
           [0024]      FIG. 5  shows a top view of the chassis in  FIG. 1  with a hitch attached. 
           [0025]      FIG. 6  shows a side view of the chassis in  FIG. 1 . 
           [0026]      FIG. 7  shows a side assembly view of an alternative exemplary apparatus in accordance with the present invention in the set position. 
           [0027]      FIG. 8  shows a side view of a chassis component of the apparatus of  FIG. 7  in accordance with the present invention. 
           [0028]      FIG. 9  shows a side assembly view of an alternative exemplary apparatus in accordance with the present invention in the set position. 
           [0029]      FIG. 10  shows a side view of a chassis component of the apparatus of  FIG. 9  in accordance with the present invention. 
       
    
    
       [0030]    Corresponding reference characters indicate corresponding parts throughout the several views. The exemplary embodiments set forth herein are not to be construed as limiting the scope of the invention in any manner. 
       DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0031]    The present invention will be discussed hereinafter in detail in terms of various exemplary embodiments according to the present invention with reference to the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be obvious, however, to those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known structures are not shown in detail in order to avoid unnecessary obscuring of the present invention. 
         [0032]    Thus, all of the implementations described below are exemplary implementations provided to enable persons skilled in the art to make or use the embodiments of the disclosure and are not intended to limit the scope of the disclosure, which is defined by the claims. As used herein, the word “exemplary” or “illustrative” means “serving as an example, instance, or illustration.” Any implementation described herein as “exemplary” or “illustrative” is not necessarily to be construed as preferred or advantageous over other implementations. Moreover, in the present description, the terms “upper”, “lower”, “left”, “rear”, “right”, “front”, “vertical”, “horizontal”, and derivatives thereof shall relate to the invention as oriented in  FIG. 1 . 
         [0033]    Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise. 
         [0034]    Referring first to  FIG. 1 , there is shown trailer assembly  1000  generally comprising chassis or frame  100 , enclosure  200 , wheels  300 , and hitch  400 . Chassis  100 , as illustrated in  FIG. 1 , may comprise any suitable material for the manufacture or production of vehicle trailer chassis, including, for example, steel, aluminum, a very high strength polymer, or a composite material. 
         [0035]    Referring next to  FIG. 2 , there is shown an exemplary embodiment of trailer assembly  1000  in accordance with the present invention. As shown in  FIG. 2 , trailer assembly  1000  generally comprises chassis  100  and enclosure  200  disposed on top of and connected to chassis  100 . Enclosure  200  may comprise an actual enclosure or an open air carrying apparatus. Enclosure  200  may further comprise various doors  250  or other access portals. Preferably, enclosure  200  comprises an access portal (not shown) near hitch  400  such that enclosure  200  is accessible by differently abled persons. Additionally, enclosure  200  may comprise any known materials suitable for constructing an enclosure or open air trailer bed, including aluminum, wood, steel, plastic, fiberglass, and composite material. 
         [0036]    Referring now to  FIGS. 3 and 4 , there is shown, respectively a top view and a top perspective view of chassis  100  of apparatus  1000  according to an exemplary embodiment of the present invention. As illustrated in  FIGS. 3 and 4 , chassis  100  of the present invention comprises a pair of parallel rails  101  and  102 . Chassis  100  further comprises a first cross member  103  and a second cross member  103 . Chassis  100  may further comprise cross member  105 . 
         [0037]    Referring still to  FIGS. 3 and 4 , each cross member  103 ,  104 ,  105  is disposed between and perpendicularly to rails  101  and  102 . Each cross member  103 ,  104 ,  105  has opposing ends fixed connected to rails  101  and  102 . As further illustrated in  FIGS. 3 and 4 , opposing ends of rear cross member  103  are respectively fixedly connected to rails  101  and  102  generally at wheel engaging segments  110 . Additionally, opposing ends of front cross member  104  are respectively fixedly connected to rails  101  and  102  generally at hitch engaging segments  130 . If desired, opposing ends of central cross member  105  can be fixedly connected to rails  101  and  102  generally at linking segment  120 . 
         [0038]    Referring now to  FIG. 5 , there is shown another top view of chassis  100  of apparatus  1000  according to an exemplary embodiment of the present invention. As illustrated in  FIG. 5 , chassis  100  of the present invention further comprises conventional trailer hitch  400 . Hitch  400  is generally fixedly connected to chassis  100  generally at the location of front cross member  104 . 
         [0039]    Referring now to  FIG. 6 , each rail  101  and  102  of chassis  100  generally comprises wheel engaging segment  110 , linking segment  120 , and hitch engaging segment  130 . As illustrated in  FIG. 6 , wheel engaging segments  110  of chassis  100  are generally disposed horizontally when viewed from the side. Each wheel engaging segment  110  is adapted to rotatably connect to one or more wheels  300 . Rails  101  and  102  of chassis  100  further comprise hitch engaging segments  130 . As further illustrated in  FIG. 6 , rails  101  and  102  of chassis  100  further comprise linking segments  120 . Linking segment  120  is adapted to connect wheel engaging segment  110  to hitch engaging segment  130 . 
         [0040]    Referring still to  FIG. 6 , wheel engaging segments  110  of rails  101  and  103  have a height as do hitch engaging segments  130 . As illustrated in  FIG. 6 , each wheel engaging segment  110  has a height greater (when compared to a support surface) than the height of hitch engaging segment  130  such that the respective heights are offset from one another. 
         [0041]    Referring still to  FIG. 6 , linking segments  120  or rails  101  and  102  comprise a change in height from a distal end to a proximal end such that the height of the proximal end of each linking segment  120  is greater than the height of the distal end of each linking segment  120  when both are compared to a support surface. Stated differently, generally, horizontally disposed wheel engaging segments  110  of each rail  101  and  102  connect to the proximal end of a linking member  120 , and hitch engaging segments  130  of each rail  101  and  102  connect to the distal end of linking segment  120  such that each wheel engaging segment  110  and hitch engaging segment  130  are generally disposed parallel to one another but offset by an amount equal to the change in height of linking segment  120 . 
         [0042]    Referring again to  FIG. 6 , those of ordinary skill in the art will appreciate that wheel engaging segments  110  of chassis  100  may be rotatably connected to one or more wheels  300  by any conventional means including a single axis that runs through all of the wheels or plurality of rotatable connections where each rotatable connection is unique to each wheel. Moreover, such connections may be connected to a prime mover including an electric motor, an internal combustion engine, or the like. Those of ordinary skill in the art will further appreciate that any number of wheels or any type of prime mover may be used within the scope of the present invention. 
         [0043]    Turning again to  FIG. 1 , trailer assembly  1000  in accordance with the present invention may be utilized in two modes. The first mode is referred to herein as a “set” mode, and the second mode is referred to herein as a “transport” mode. As further illustrated in  FIG. 1 , the set mode of trailer assembly  1000  is used to provide convenient access to enclosure  200  of trailer assembly  1000 . Once enclosure  200  is fully loaded or fully accessed by a person, including a person who may or may not have disabilities, hitch  400  is attached to a vehicle (not shown) such that trailer assembly  1000  is pivoted about a central axis of wheels  300  such that trailer assembly  1000  may be pulled by a vehicle along a support surface such as a road. 
         [0044]    Referring next to  FIG. 7 , there is shown an alternative exemplary embodiment of trailer assembly  1000  in accordance with the present invention. As shown in  FIG. 7 , trailer assembly  1000  generally comprises chassis  100  and enclosure  200  disposed on top of and connected to chassis  100 . Enclosure  200  may comprise an actual enclosure or an open air carrying apparatus. Enclosure  200  may further comprise various doors  250  or other access portals. Preferably, enclosure  200  comprises an access portal (not shown) near hitch  400  such that enclosure  200  is accessible by differently abled persons. Additionally, enclosure  200  may comprise any known materials suitable for constructing an enclosure or open air trailer bed, including aluminum, wood, steel, plastic, fiberglass, and composite material. 
         [0045]    Referring now to  FIGS. 3 and 4 , there is shown, respectively a top view and a top perspective view of chassis  100  of apparatus  1000  according to an exemplary embodiment of the present invention. As illustrated in  FIGS. 3 and 4 , chassis  100  of the present invention comprises a pair of parallel rails  101  and  102 . Chassis  100  further comprises a first cross member  103  and a second cross member  103 . Chassis  100  may further comprise cross member  105 . 
         [0046]    Referring still to  FIGS. 3 and 4 , each cross member  103 ,  104 ,  105  is disposed between and perpendicularly to rails  101  and  102 . Each cross member  103 ,  104 ,  105  has opposing ends fixed connected to rails  101  and  102 . As further illustrated in  FIGS. 3 and 4 , opposing ends of rear cross member  103  are respectively fixedly connected to rails  101  and  102  generally at wheel engaging segments  110 . Additionally, opposing ends of front cross member  104  are respectively fixedly connected to rails  101  and  102  generally at hitch engaging segments  130 . If desired, opposing ends of central cross member  105  can be fixedly connected to rails  101  and  102  generally at linking segment  120 . 
         [0047]    Referring now to  FIG. 5 , there is shown another top view of chassis  100  of apparatus  1000  according to an exemplary embodiment of the present invention. As illustrated in  FIG. 5 , chassis  100  of the present invention further comprises conventional trailer hitch  400 . Hitch  400  is generally fixedly connected to chassis  100  generally at the location of front cross member  104 . 
         [0048]    Referring now to  FIG. 8 , a side view of chassis  100  from  FIG. 7 , each rail  101  and  102  of chassis  100  generally comprises wheel engaging segment  110 , linking segment  120 , and hitch engaging segment  130 . As illustrated in  FIG. 8 , wheel engaging segments  110  of chassis  100  are generally disposed horizontally when viewed from the side. Each wheel engaging segment  110  is adapted to rotatably connect to one or more wheels  300 . Rails  101  and  102  of chassis  100  further comprise hitch engaging segments  130 . As further illustrated in  FIG. 6 , rails  101  and  102  of chassis  100  further comprise linking segments  120 . Linking segment  120  is adapted to connect wheel engaging segment  110  to hitch engaging segment  130 . 
         [0049]    Referring still to  FIG. 8 , wheel engaging segments  110  of rails  101  and  103  have a height as do hitch engaging segments  130 . As illustrated in  FIG. 8 , each wheel engaging segment  110  has a height greater (when compared to a support surface) than the height of hitch engaging segment  130  such that the respective heights are offset from one another. 
         [0050]    Referring still to  FIG. 8 , linking segments  120  or rails  101  and  102  comprise a change in height from a distal end to a proximal end such that the height of the proximal end of each linking segment  120  is greater than the height of the distal end of each linking segment  120  when both are compared to a support surface. Stated differently, generally, horizontally disposed wheel engaging segments  110  of each rail  101  and  102  connect to the proximal end of a linking member  120 , and hitch engaging segments  130  of each rail  101  and  102  connect to the distal end of linking segment  120  such that each wheel engaging segment  110  and hitch engaging segment  130  are generally disposed parallel to one another but offset by an amount equal to the change in height of linking segment  120 . 
         [0051]    Referring again to  FIG. 8 , those of ordinary skill in the art will appreciate that wheel engaging segments  110  of chassis  100  may be rotatably connected to one or more wheels  300  by any conventional means including a single axis that runs through all of the wheels or plurality of rotatable connections where each rotatable connection is unique to each wheel. Moreover, such connections may be connected to a prime mover including an electric motor, an internal combustion engine, or the like. Those of ordinary skill in the art will further appreciate that any number of wheels or any type of prime mover may be used within the scope of the present invention. 
         [0052]    Turning again to  FIG. 1 , in the embodiments of  FIGS. 7 and 8 , trailer assembly  1000 , in accordance with the present invention, may be utilized in two modes. The first mode is referred to herein as a “set” mode, and the second mode is referred to herein as a “transport” mode. As further illustrated in  FIG. 1 , the set mode of trailer assembly  1000  is used to provide convenient access to enclosure  200  of trailer assembly  1000 . Once enclosure  200  is fully loaded or fully accessed by a person, including a person who may or may not have disabilities, hitch  400  is attached to a vehicle (not shown) such that trailer assembly  1000  is pivoted about a central axis of wheels  300  such that trailer assembly  1000  may be pulled by a vehicle along a support surface such as a road. 
         [0053]    Referring next to  FIG. 9 , there is shown an alternative exemplary embodiment of trailer assembly  1000  in accordance with the present invention. As shown in  FIG. 2 , trailer assembly  1000  generally comprises chassis  100  and enclosure  200  disposed on top of and connected to chassis  100 . Enclosure  200  may comprise an actual enclosure or an open air carrying apparatus. Enclosure  200  may further comprise various doors  250  or other access portals. Preferably, enclosure  200  comprises an access portal (not shown) near hitch  400  such that enclosure  200  is accessible by differently abled persons. Additionally, enclosure  200  may comprise any known materials suitable for constructing an enclosure or open air trailer bed, including aluminum, wood, steel, plastic, fiberglass, and composite material. 
         [0054]    Referring now to  FIGS. 3 and 4 , there is shown, respectively a top view and a top perspective view of chassis  100  of apparatus  1000  according to an exemplary embodiment of the present invention. As illustrated in  FIGS. 3 and 4 , chassis  100  of the present invention comprises a pair of parallel rails  101  and  102 . Chassis  100  further comprises a first cross member  103  and a second cross member  103 . Chassis  100  may further comprise cross member  105 . 
         [0055]    Referring still to  FIGS. 3 and 4 , each cross member  103 ,  104 ,  105  is disposed between and perpendicularly to rails  101  and  102 . Each cross member  103 ,  104 ,  105  has opposing ends fixed connected to rails  101  and  102 . As further illustrated in  FIGS. 3 and 4 , opposing ends of rear cross member  103  are respectively fixedly connected to rails  101  and  102  generally at wheel engaging segments  110 . Additionally, opposing ends of front cross member  104  are respectively fixedly connected to rails  101  and  102  generally at hitch engaging segments  130 . If desired, opposing ends of central cross member  105  can be fixedly connected to rails  101  and  102  generally at linking segment  120 . 
         [0056]    Referring now to  FIG. 5 , there is shown another top view of chassis  100  of apparatus  1000  according to an exemplary embodiment of the present invention. As illustrated in  FIG. 5 , chassis  100  of the present invention further comprises conventional trailer hitch  400 . Hitch  400  is generally fixedly connected to chassis  100  generally at the location of front cross member  104 . 
         [0057]    Referring now to  FIG. 10 , which shows a side view of chassis  100  from  FIG. 9 , each rail  101  and  102  of chassis  100  generally comprises wheel engaging segment  110 , linking segment  120 , and hitch engaging segment  130 . As illustrated in  FIG. 10 , wheel engaging segments  110  of chassis  100  are generally disposed horizontally when viewed from the side. Each wheel engaging segment  110  is adapted to rotatably connect to one or more wheels  300 . Rails  101  and  102  of chassis  100  further comprise hitch engaging segments  130 . As further illustrated in  FIG. 10 , rails  101  and  102  of chassis  100  further comprise linking segments  120 . Linking segment  120  is adapted to connect wheel engaging segment  110  to hitch engaging segment  130 . 
         [0058]    Referring still to  FIG. 10 , wheel engaging segments  110  of rails  101  and  103  have a height as do hitch engaging segments  130 . As illustrated in  FIG. 10 , each wheel engaging segment  110  has a height greater (when compared to a support surface) than the height of hitch engaging segment  130  such that the respective heights are offset from one another. 
         [0059]    Referring still to  FIG. 10 , linking segments  120  or rails  101  and  102  comprise a change in height from a distal end to a proximal end such that the height of the proximal end of each linking segment  120  is greater than the height of the distal end of each linking segment  120  when both are compared to a support surface. Stated differently, generally, horizontally disposed wheel engaging segments  110  of each rail  101  and  102  connect to the proximal end of a linking member  120 , and hitch engaging segments  130  of each rail  101  and  102  connect to the distal end of linking segment  120  such that each wheel engaging segment  110  and hitch engaging segment  130  are generally disposed parallel to one another but offset by an amount equal to the change in height of linking segment  120 . 
         [0060]    Referring again to  FIG. 10 , those of ordinary skill in the art will appreciate that wheel engaging segments  110  of chassis  100  may be rotatably connected to one or more wheels  300  by any conventional means including a single axis that runs through all of the wheels or plurality of rotatable connections where each rotatable connection is unique to each wheel. Moreover, such connections may be connected to a prime mover including an electric motor, an internal combustion engine, or the like. Those of ordinary skill in the art will further appreciate that any number of wheels or any type of prime mover may be used within the scope of the present invention. 
         [0061]    Turning again to  FIG. 1 , in the embodiments of  FIGS. 9 and 10 , trailer assembly  1000 , in accordance with the present invention, may be utilized in two modes. The first mode is referred to herein as a “set” mode, and the second mode is referred to herein as a “transport” mode. As further illustrated in  FIG. 1 , the set mode of trailer assembly  1000  is used to provide convenient access to enclosure  200  of trailer assembly  1000 . Once enclosure  200  is fully loaded or fully accessed by a person, including a person who may or may not have disabilities, hitch  400  is attached to a vehicle (not shown) such that trailer assembly  1000  is pivoted about a central axis of wheels  300  such that trailer assembly  1000  may be pulled by a vehicle along a support surface such as a road. 
         [0062]    While this invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.