The invention relates to an articulating storage and transportation system for recreational vehicles, comprising a rack mounted on a cargo box attached to a rear door. The system features a parallelogram mechanism with linear actuators, allowing the rack to lower while maintaining a parallel orientation to the cargo box surface. This design improves accessibility for loading and unloading equipment, particularly bicycles. The rack can rest on the opposite door's tire for added stability and incorporates modular attachments for versatility. Additional features include a locking mechanism, guiding system, and potential integration of powered accessories, enhancing functionality and user experience for RV enthusiasts.

A shock absorber (D) of the present invention includes: a cylinder (1); a piston (2) that is movably inserted into the cylinder (1) and partitions an inside of the cylinder (1) into an extension side chamber (R1) and a compression side chamber (R2) filled with a liquid; a piston rod (3) that is inserted into the cylinder (1) and connected to the piston (2); an outer tube (4) that is disposed on an outer peripheral side of the cylinder (1) and forms a liquid storage chamber (R3) filled only with a liquid inside; a damping passage (P) that allows communication between the extension side chamber (R1) and the liquid storage chamber (R3); a variable damping valve (V) that is provided in the damping passage (P) and capable of adjusting resistance applied to a flow of a liquid from the extension side chamber (R1) to the liquid storage chamber (R3); and a tank (6) that is disposed outside the outer tube (4) and communicates with the liquid storage chamber (R3) to store a liquid.