Abstract:
A universal, adaptable hanger mounted cargo carrier for removable mounting over and around a trailer frame without requiring modification of either I-beam or box beam trailer rails. The carrier comprises a generally rectangular box with steel mesh floor and opposed inverted corner J-hook mounts for slidable mounting of the carrier over the trailer frame rail extending deep enough below the bottom of the rail to enable a locking mechanism to at least partially close the opening of the inverted J-hook below the frame. Inverted “U” shaped spacers reduce the size of the J-hook opening, thereby adapting the carrier for flush mounting on a range of different sized rails. A steel mesh floor and holes in the walls of the carrier for insertion of hook ends of bungee cords allow for retention and transport of objects of varying size and shape.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
   This is the Regular U.S. Patent Application of prior Provisional Patent Application Ser. No. 60/790,199 filed Apr. 7, 2006 by the same inventors, entitled “Cargo Carrier for Boat Trailers”, the priority of which is hereby claimed under 35 USC 119(e), 120, and the disclosure of which is hereby incorporated by reference in its entirety. 

   FIELD OF THE INVENTION 
   The invention relates to package and article carriers, in particular, to an adjustable hanger cargo carrier removably mountable over the framework of a boat trailer for carrying and transporting a variety of supplies, goods and equipment for use in boating and ancillary activities. 
   BACKGROUND OF THE INVENTION 
   A common problem among boaters is that there is not enough space to haul all the miscellany of fuel, food, supplies, materials, and equipment, plus all of the people who need transportation to a lake, oceanfront, river or other boating site. Boats are commonly transported on trailers from the place of storage to the place of use. Once the vehicle space is allocated to people and whatever can be carried in the vehicle, no additional space is available except in the boat hull where it is not advisable, safe or convenient to carry equipment, material, supplies or people. Loose equipment and supplies placed in the boat may be thrown during transport, break open and spill contents or bounce out, and in the process create a safety hazard during transport. 
   Commercially available boat trailers typically comprise a tongue at the leading edge of a double rail frame, with the front end of the two rails coming together at the trailing end of the tongue, forming a generally “Y” shaped trailer. The front of the tongue (the base of the “Y”) fastens to the trailer hitch at the back of the towing vehicle. When on the trailer, the bow of the boat is above the front, merging end of the two rails where they converge. The trailer rails commercially available in the United States come in varying widths at intervals of 2 inches (5.1 cm), 2.5 inches (6.4 cm) and 3 inches (7.6 cm). 
   Various vehicle-top carriers and trailer hitch auxiliary carriers are available, and while they may contribute to alleviating the cargo problem, they have definite drawbacks, such as increasing the vehicle height and center of gravity, or increasing vehicle length. Using a trailer hitch carrier also precludes use of the trailer hitch for towing a trailer. Accordingly, there continues to be a need for increased cargo capacity within the existing envelope of the unmodified vehicle-boat-and-trailer space. 
   U.S. Pat. No. 5,855,309 to Hallsworth discloses one example of a cargo carrier for boat trailers. The carrier disclosed in Hallsworth comprises a rectangular-shaped frame made of angled channels with a metal hinged strap for fitting through the handle of a five gallon gas can or ice chest. A second embodiment comprises an I-Frame formed by two angled channels separated by telescoping adjustable plates. In both embodiments, one side of the angled channels is bolted to the boat trailer frame via a bracket overlapping the top side of the trailer rail. Mounting of the cargo frame disclosed in Hallsworth requires the time, effort and tools to drill holes into the trailer rail at specified points to bolt the cargo frame to the rail. 
   As a result, the Hallsworth cargo frame cannot be removed easily and would likely become a permanent fixture to the trailer frame once mounted. Nor may its position along the trailer rail be adjusted without drilling additional holes along the course of the metal rail. Drilling of holes in the metal trailer rail may lead to rust and corrosion around the holes and weaken the strength of the rail. In addition, the Hallsworth cargo frame is designed for retaining square or rectangular-shaped objects, only, having a flat base of a dimension that spans the width of the bottomless frame, such as five gallon gas cans or ice chests. 
   Accordingly, there is a need in the art for a trailer cargo carrier that is both quick and easy to mount onto, and remove from, the trailer rail; that is easily adjustable along the length of the rail; that may be mounted to a variety of rails of different widths; that may be mounted to rails without the need for drilling holes into the rail, and can be used to carry and transport a variety of different sized and shaped objects. 
   THE INVENTION 
   Summary of the Invention 
   The present invention is a cargo carrier comprising a horizontally-oriented basket assembly attached to dual hanger type inverted J-hook mounts to retain the basket assembly against a boat trailer through slidable insertion of the J-hook mounts over and around the trailer rail. Spacers or adapters either slidably mounted on the trailer rail or mounted to the inside perimeter of the J-hook mounts allow for mounting of the carrier on trailer rails of different widths. The inventive cargo carrier provides additional cargo capacity without increasing the overall envelope of the trailer, boat, and towing vehicle configuration. 
   The basket assembly comprises a four-sided, generally rectangular open tray or box on the order of 4 inches to 12 inches (10.2 cm to 30.5 cm) deep with a continuous steel mesh floor. The walls of the basket assembly are made of angle iron or steel material. In an alternate embodiment, both the walls and the floor are mesh. 
   The cargo carrier is cantilever mounted to the trailer frame by hanging inverted J-hook mounts over the top of the trailer rail. The inverted J-hook mounts are located at opposed corners of the cargo carrier. The inverted “U” shaped opening of the inverted J hook mount fits over a wide range of boat trailer side rails and is deep enough to extend below the bottom of the trailer frame member. 
   A locking mechanism, such as a bolt, padlock or bar partially block or completely close the opening of the inverted J hook below the frame, thereby preventing the carrier from being thrown off the trailer rail, and preventing the theft of the carrier from an untended trailer. “U”-shaped spacer inserts are available as adapters to reduce the size of the J-hook opening, thereby adapting the cargo carrier for flush mounting on different sized trailer frames. 
   The inventive cargo carrier is especially adapted to be cantilever mounted on the trailer frame beneath the port or starboard bow of the boat (or both) to take advantage of the unused space below the bow, but does not extend beyond the perimeter of the trailer wheels. As a result, the cargo carrier is safely secured within the envelope of the trailer and does not pose a hazard to passing traffic. 
   Neither box beam nor I-beam trailer rails require modification, such as drilling of holes, welding of special brackets, or the like, to accept the inventive cargo carrier mounts. The inventive carrier may be provided fully assembled or in kit form. The entire assembly can be broken down into, and packaged in boxes of 4 foot (1.22 m) lengths for ease of standard carrier shipping. 
   When not in use, the inventive cargo carrier does not interfere with normal use of the trailer. The carrier may remain mounted to the trailer rail, or easily removed, used for multiple trailers of same or different rail widths, or may be removed for storage. 
   The cargo carrier is not limited in design for carrying a specific item or size of item. Rather, cargo of various sizes, dimensions, and parts (e.g., coolers, gas tanks, bags, chopped wood, tackle boxes, or combinations thereof) may be stored and transported in the inventive cargo carrier. Cargo carrier hold downs retain the items in the basket assembly. Stretchable bungee cords, ropes, or other ties may be used to secure the load. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention is described in more detail with reference to the attached drawings, in which: 
       FIG. 1  is a perspective view of a boat mounted on a trailer with the inventive cargo carrier mounted on a rail of the trailer frame beneath the port bow of the boat; 
       FIG. 2A  is a perspective view of an unmounted first embodiment of the inventive cargo carrier; 
       FIG. 2B  is a perspective view of an unmounted second embodiment of the inventive cargo carrier; 
       FIG. 3A  is a partial elevation view of the J-hook mount with bolt locking mechanism; 
       FIG. 3B  is a partial elevation view of the J-hook mount with padlock locking mechanism; 
       FIG. 4A  is an isometric exploded view of an alternate embodiment of the J-hook mount; 
       FIG. 4B  is an isometric exploded view of an alternate embodiment of the J-hook mount comprising a strap-type hook; 
       FIGS. 5A-5C  are isometric views of different embodiments for an inverted “U”-shaped mounting spacer used with the inverted J-hook mount for mounting the cargo carrier to smaller trailer frames; and, 
       FIG. 6  is a perspective view an unmounted embodiment of the inventive cargo carrier loaded with firewood. 
   

   DETAILED DESCRIPTION 
   The following detailed description illustrates the invention by way of example, not by way of limitation of the scope, equivalents or principles of the invention. This description describes several embodiments, adaptations, variations, alternatives and uses of the invention. 
   In this regard, the invention is illustrated in the several figures, and is of sufficient complexity that the many parts, interrelationships, and sub-combinations thereof cannot be fully illustrated in a single patent-type drawing. For clarity and conciseness, several of the drawings show in schematic, or omit, parts that are not essential in that drawing to a description of a particular feature, aspect or principle of the invention being disclosed. Thus, the best mode embodiment of one feature may be shown in one drawing, and the best mode of another feature will be called out in another drawing. 
   All publications, patents and applications cited in this specification are herein incorporated by reference as if each individual publication, patent or application had been expressly stated to be incorporated by reference. 
     FIG. 1  shows the preferred embodiment of the inventive cargo carrier  10  installed on the port rail  14  of a boat trailer  12  prior to the loading of cargo into the carrier  10 . As shown in  FIG. 1 , the port rail  14  and starboard rails  16  come together at a forward end and join at the base of the trailer tongue  18 . The boat trailer  12  is shown retaining boat  20 . 
   In the preferred embodiment shown in  FIG. 1 , the inventive carrier  10  comprises a generally rectangular box-shaped basket assembly  22  including a base or floor portion  36 , opposed inboard and outboard side walls  32 ,  34 , opposed left and right side walls  24 ,  26 , each of the side walls interconnecting the base  36 . Two, spaced inverted J-hook mounts  28  are attached to the basket assembly  22 . Each of the J-hook mounts  28  is shaped to form an inverted generally U-shaped opening as shown in  FIGS. 3A and 3B . The J-hook mounts  28  are shaped for slidable, removable hanger mounting over the side rail  14  of the boat trailer  12  preferably proximate the trailer tongue  18  and underneath the bow of the boat  20 . The U-shaped opening of the J-hook mount has a closed top end and an open bottom end, and is shaped to come into flush contact with the top and side surfaces of the boat trailer rail when the carrier is mounted. 
   More than two J-hook mounts  28  may be attached to the carrier  10 , as desired, for example, if the basket assembly  22  were long and narrow. One or more cargo carriers  10  may be mounted on the starboard rail  16  and/or port rail  14  of a boat trailer  12 . 
   As discussed further in connection with  FIGS. 3A and 3B , each J-hook mount  28  comprises a locking mechanism  30  proximate the bottom end of the U-shaped opening of the J-hook mount  28  as a safety measure against unauthorized removal and unavoidable road jolts causing one or more of the J-hook mounts  28  to be pushed off the trailer rail  14 / 16  during transport. As discussed further in connection with  FIG. 6 , the cargo carrier  10  further comprises at least one cargo hold down, such as a bungee cord, with opposed attachment ends for attachment to the basket assembly, thereby securing the load in the cargo carrier  10 . 
   Referring to  FIG. 1 , the inboard sidewall  32  is closest to the boat trailer  12  when installed, and the outboard sidewall  34  is furthest from the boat trailer  12  when installed. Left side wall  24  is closer to the bow of the boat  20  when the carrier  10  is installed on the port rail  14 ; the right side wall  26  is closer to the bow of the boat  20  when the carrier  10  is installed on the starboard rail  16 . 
   As shown in  FIG. 1 , the basket assembly  22  is generally rectangular in shape, but may be any desired shape, including a curved shape, and of any desired depth, provided the outboard side wall  34  of the carrier  10 , when mounted to the rail  14 ,  16  of a trailer  12 , does not protrude past the wheel tracking line  44  for the trailer wheel  38 . Because the inventive cargo carrier  10  does not protrude beyond the wheel line  44 , it occupies space within the original overall envelope of the vehicle, trailer, and boat, and does not pose a safety risk to other vehicles on the road. 
   Side walls  24 ,  26 ,  32  and  34  are formed with angle iron bent or welded at the corners. J-hook mounts  28  are formed of ¼ inch (0.635 cm) mild steel plate and are shown bolted to side walls  24 ,  26 , respectively, but could be welded. Base  36  of the basket assembly  22  is constructed of steel or wire mesh welded to the internal corners of the angle iron side walls  24 ,  26 ,  32 ,  34 . The preferred dimensions of the basket assembly  22  are 44 inches (long) by 20 inches (wide) by 4 inches (deep), but any suitable or desired dimensions for the side walls  24 ,  26 ,  32 ,  34  and corresponding dimensions for the base  36  may be utilized, and one or more inventive carrier(s)  10  may be mounted at any location along the trailer rail(s)  14 / 16  provided the outboard side wall  34  does not protrude past the wheel tracking line  44  for the trailer wheel  38 . 
   The preferred embodiment of the inventive carrier  10  is a unitary version using all-weld construction with the J-hook mounts  28  bolted to the external sides of left and right side walls  24 ,  26 . However, the carrier parts may be welded, riveted and/or bolted together. Plastic parts, if of sufficient strength, can be substituted for metal parts. 
     FIG. 2A  shows an inboard isometric view of an unmounted preferred embodiment of the inventive cargo carrier  10 . As shown in  FIG. 2A , the base of the two inverted J-hook mounts  28  are bolted to sidewalls  24  and  26  and serve as the principle corner members. Holes  40  approximately 0.5 inches in diameter (1.3 cm) are drilled into the center of sidewalls  24 ,  26 ,  32 ,  34  proximate the top margin of each side wall. The holes  40  are used in securing cargo retained by the carrier  10 . Attachment hook ends of bungee cords (shown in  FIG. 6 ) may be angled inside and through the one or more holes  40  in the basket assembly  22  to span the open top of the carrier  10 . Any number of desired holes  40  at any desired location(s) within the side walls  24 ,  26 ,  32 ,  34  may be utilized. Any suitable method for retaining the cargo within the carrier  10  may be utilized, including without limitation, bungee cords, ropes tied through the holes  40 , and the like. One or more of the hook ends of the bungee cord(s) or rope ends could alternately be secured in the openings formed by the mesh bottom  36  or sidewalls if the walls are also constructed of steel mesh as shown in  FIG. 2B . 
     FIG. 2B  shows a perspective view of an unmounted second embodiment of the inventive cargo carrier  42  constructed with mesh floor  36  and mesh side walls  24 ,  26 ,  32 ,  34 . The outboard corners and lower edges are framed with angle iron. 
     FIGS. 3A and 3B  show alternate embodiments of the locking mechanism  30  for the J-hook mount  28 . The purpose of the locking mechanism  30  is to hold the carrier  10  securely to the boat trailer frame  12  against either unauthorized removal or unavoidable road jolts. Each inverted J-hook mount  28  forms a U-shaped opening having a closed top end and an open bottom end. The locking mechanism  30  is positioned proximate the open bottom end of the U-shaped opening. 
     FIG. 3A  shows a nut  46  and bolt  47  locking mechanism  30  for the J-hook mount  28 . Lock nut  46  is welded to the outboard side of the J-hook mount proximate the open bottom end of the U-shaped opening. Lock nut  46  forms a hole for insertion of bolt  47 . Bolt  47  is shown inserted into nut  46 , but only partially screwed into nut  46 . As a result, bolt  47  protrudes into the bottom end of the U-shaped opening. Line  54  runs across the bottom end of the U-shaped opening and represents the base of the rail  14  over which the J-hook  28  is slidably mounted. As shown by  FIG. 3A , once the bolt  47  is partially screwed into lock nut  46 , if the trailer rail  14  is jostled, or the J-hook mount  28  is jostled, the bolt  47  would come into contact with the base of the trailer rail  54  and would prevent the J-hook mount  28  from being thrown from the rail  14 . 
     FIG. 3B  shows a padlock  48  locking mechanism  30  for the J-hook mount  28 . Nut  46 , which may be a lock nut or other type of nut, is welded to the outboard side of the J-hook mount proximate the open bottom end of the U-shaped opening. Nut  46  forms a hole for insertion of a padlock  48  hasp. The hasp of padlock  48  is shown inserted into and through the hole formed by nut  46  and locked in place. As a result, portions of padlock  48  protrude into the bottom end of the U-shaped opening. Line  54  runs across the bottom end of the U-shaped opening and again represents the base of the rail  14  over which the J-hook  28  is slidably mounted. As shown by  FIG. 3B , once the padlock  48  is locked in nut  46 , if the trailer rail  14  is jostled, or the J-hook mount  28  is jostled, the base  54  of rail  14  would come into contact with the padlock  48  and would prevent the J-hook mount  28  from being thrown from the rail  14 . 
   Any other suitable locking mechanism  30  could be employed, such as chains, lock bars, and the like. For example, the locking mechanism  30  could comprise a lock bar with lock bar guides. In this embodiment, the lock bar would be a steel rod bent at one end to form an integral L-shaped lock bar handle for easy gripping, rotation, and sliding back and forth through lock bar guides and in and out of a lock bar ring. A chain locking mechanism would comprise a chain attached at one end proximate the bottom end of the U-shaped opening with a latch hook at the other end of the chain that could be secured to the J-hook mount  28  after the inventive cargo carrier  10  is slidably mounted onto the trailer rail  14 . 
     FIGS. 4A and 4B  are exploded isometric views of alternate embodiments for the J-hooks mounts  28 . Referring to  FIG. 4A , the J-hook mounts  28  are bolted to a flange  52  that is an extension of side walls  24 ,  26 . Referring to  FIG. 4B , the J-hook mounts  28  are integrated into the inboard side wall  32  as the vertical end-strut. 
     FIGS. 5A-5C  show alternate embodiments for an inverted “U”-shaped mounting spacer or adapter  56  used with the inverted J-hook mount  28  for mounting the cargo carrier  10  to smaller trailer frames  12 .  FIG. 5A  shows a generally-rectangular shaped spacer  56  with open base that forms a U shaped opening designed for flush mounting over the top of a trailer rail  14 / 16 . Opposed flanges define a space around the perimeter of the adapter  56  over and into which the J-hook mount may be slidably inserted.  FIG. 5B  shows a generally-rectangular shaped spacer  56  with open base that forms a U shaped opening designed for flush mounting over the top of a trailer rail  14 / 16 , but which does not include flanges.  FIG. 5C  shows a generally-rectangular shaped spacer  56  with open base that forms a U shaped opening designed for flush mounting over the top of a trailer rail  14 / 16  that includes a channel on its perimeter for slidable mounting and retention of the J-hook mount. Any suitable shape or design for an adapter  56  may be utilized; any number of adapters may be stacked on themselves to bring the size of the trailer rail  14 / 16  into conformity for the size of the U-shaped opening on the J-hook mount  28 . 
   The spacer/adapter  56  may be constructed of steel plate, iron strap, robust plastics, or the like, provided the outside dimensions of the spacer  56  (or multiple, stacked spacers  56 ) fit inside the U-shaped opening of the inverted J-hook mount  28  as shown in  FIGS. 3A and 3B . The inside dimensions of the adapter are selected such that it can be placed over a trailer frame  12  with a snug fit at the points that the J-hook mounts  28  will be placed when the cargo carrier  10  is mounted to the trailer frame  12 . A J-hook mount  28  designed to fit the largest trailer frame  12  can thus be used with diverse mount spacers to fit smaller-dimension trailer frames. Alternately, the spacer  56  may be constructed of sturdy rubber tubing, vinyl tubing, or other bendable but sturdy material that can be retained around the inside perimeter of the U-shaped opening formed by the inverted J-hook mount  28  as shown in  FIGS. 3A and 3B . 
     FIG. 6  is a perspective view of an alternate unmounted embodiment of the inventive cargo carrier  42  loaded with firewood  58 . As shown in  FIG. 6 , the cargo maintained in the carrier  42 , in this case chopped wood  58 , is held down and secured by a bungee cord  60  spanning the top of the carrier  10  and secured through inserting of hooks  62  at each end of the bungee cord  60  into holes formed by the mesh side walls  24 ,  26  of the carrier  42 . Alternately, hook ends  62  of bungee cord  60  could be inserted into holes  40  formed in solid side walls as shown in  FIG. 2A . 
   In an alternate embodiment, the inventive carrier  10 / 42  is provided in a knockdown, kit-type embodiment. In this embodiment, the inventive cargo carrier  10 / 42  comprises a “bolt together” multiple piece kit assembly. In this embodiment, the assembly is bolted together to enable its disassembly for shipping or storage. In this manner, the inventive cargo carrier  10 / 42  may be disassembled and stacked compactly as for shipping in kit form, or for storage. The entire assembly can be broken down into, and packaged in boxes of 4 foot (1.22 m) lengths for ease of standard carrier shipping in standard-length containers. 
   A method for mounting the inventive cargo carrier  10  includes the steps of: (1) positioning the inboard side of the basket assembly generally parallel to the boat trailer rail in the general desired proximity for where the carrier is to be mounted along the length of the rail; (2) positioning the J-hook mounts of the carrier over and above the boat trailer rail; (3) slidably engaging the J-hook mounts over and around the boat trailer rail and permitting the J-hook mounts to slide downwards over the rail until the closed end of the J-hook mounts contact and rest on the boat trailer rail; (4) engaging the locking mechanism of at least one of the J-hook mounts through, for example, partially threading a bolt into the nut welded to the J-hook mount, or sliding a hasp of a padlock through the nut and locking the padlock; (5) loading the basket assembly with desired articles for transport; and, (6) securing the articles in the basket assembly with at least one cargo hold down tied to or hooked into holes in the side walls of the basket assembly and/or the floor/base portion. The cargo hold down could be one or more bungee cords, ropes, ties, or a combination thereof. 
   In the event spacers are required to reduce the size of the U-shaped opening of the J-hook mount to fit flush around the rail, one or more spacers may be placed (or stacked) on the rail prior to the step of slidably engaging the J-hook mounts over and around the boat trailer rail. Alternately, one or more spacers may be inserted into the U-shaped openings of the J-hook mounts prior to the step of slidably engaging the J-hook mounts over and around the boat trailer rail. 
   INDUSTRIAL APPLICABILITY 
   It is clear that the inventive package and article boat cargo carrier in this application has wide applicability to the boating industry, namely to recreational boaters seeking additional space for carrying equipment, materials, and supplies when towing boats to and from or between places where the boats are used or stored. The present invention provides additional cargo capacity that occupies otherwise unused space, and is especially useful, for example, as a place to carry and transport boat fuel, bait boxes, live catch boxes and the like, keeping them external to both the boat and the vehicle. The basket assembly which includes a continuous mesh floor allows the cargo carrier to be used to store and transport a variety of types of cargo of different sizes, dimensions, and parts, including tackle boxes, chopped wood, bags, and coolers of varying sizes. The trailer rails do not require modification, such as drilling of holes, welding of special brackets, or the like, to accept the inventive cargo carrier J-hook mounts, and the mounts may be inserted over rails of different widths using the adapters. Thus, the inventive carrier has the clear potential of becoming adopted as the new standard for apparatus and methods of increasing cargo space under these circumstances. 
   It should be understood that various modifications within the scope of this invention can be made by one of ordinary skill in the art without departing from the spirit thereof and without undue experimentation. For example, the mounting and locking method can have a wide range of designs to provide the functionalities disclosed herein. Likewise, the design and construction of the various sides and bottom of the inventive cargo carrier may use a variety of materials, techniques, and methods rather than those specifically described herein. This invention is therefore to be defined by the scope of the appended claims as broadly as the prior art will permit, and in view of the specification if need be, including a full range of current and future equivalents thereof. 
   
     
       
             
           
             
             
           
         
             
                 
             
             
               PARTS LIST to assist examination; may be cancelled  
             
             
               upon allowance at option of Examiner. 
             
             
                 
             
           
           
             
                 
             
           
        
         
             
                 
               10 inventive cargo carrier 
             
             
                 
               12 boat trailer 
             
             
                 
               14 port rail 
             
             
                 
               16 starboard rail 
             
             
                 
               18 trailer tongue 
             
             
                 
               20 boat 
             
             
                 
               22 basket assembly 
             
             
                 
               24 left side wall of basket assembly 22 
             
             
                 
               26 right side wall of basket assembly 22  
             
             
                 
               28 inverted J-hook mount (two) 
             
             
                 
               30 locking mechanism 
             
             
                 
               32 inboard side wall of basket assembly 22 
             
             
                 
               34 outboard side wall of basket assembly 22 
             
             
                 
               36 bottom or base 
             
             
                 
               38 trailer wheel/tire 
             
             
                 
               40 hole 
             
             
                 
               42 mesh cargo carrier embodiment 
             
             
                 
               44 wheel tracking line 
             
             
                 
               46 nut/lock nut 
             
             
                 
               47 bolt 
             
             
                 
               48 padlock 
             
             
                 
               50 bolted attachment 
             
             
                 
               52 flange 
             
             
                 
               54 base of rail 
             
             
                 
               56 U shaped insert 
             
             
                 
               58 chopped wood 
             
             
                 
               60 cargo carrier hold down 
             
             
                 
               62 hook end 
             
             
                 
               “S” - Starboard 
             
             
                 
               “P” - Port 
             
             
                 
               “U” - U-shaped opening