Patent ID: 8444156

Claim:
A trailer for traveling over rough terrain and attached to a vehicle that includes a motor for pulling said trailer, said trailer comprising: an elongated main frame for supporting a trailer body; a plurality of rearwardly-extending frame arms located on opposite sides of said main frame, each of which includes a proximal end and a distal end; each said proximal end being pivotably connected to said main frame and each said distal end having at least one rotatable wheel mounted thereon; a generally U-shaped cross member associated with said plurality of frame arms for supporting said main frame, said cross-member being pivotably connected to said plurality of frame arms and being configured to enable said main frame and said plurality of frame arms to pivot about a lengthwise axis of said main frame for the purpose of maintaining said main frame level from side to side; a pivot axle associated with said plurality of frame arms for connecting said proximal ends of each said plurality of frame arms, said pivot axle permitting relative movement of said plurality of frame arms about said pivot axle; at least one length-adjustable member operatively connected to said main frame and at least one of said plurality of frame arms; selective movement of said length-adjustable member causing said distal end of at least one of said plurality of frame arms to move up or down; and a level detector for producing and applying leveling signals to each of said length-adjustable members; said leveling signals causing each of said length-adjustable members to position each of said frame arms such that said elongated main frame is maintained in a relatively level orientation when said trailer encounters uneven terrain; wherein each frame arm further includes a stabilizer arm interconnecting said main frame and each said frame arm for providing lateral stability of said distal end, and each stabilizer arm includes a link and is extendable and retractable so that the main frame is adjustable relative to the position of the frame arm.