Abstract: A trailer for conveniently loading and transporting a four wheel vehicle includes a bi-stable interactive ramp that is integral with the trailer. A support bar enables the ramp to pivot about the support bar's axis between two stable positions, one of the positions being in an inclined position when the vehicle is being loaded or unloaded, and the second of the positions being in a horizontal position after the vehicle is loaded. A rear-wheels support frame supports the rear wheels of the ATV when loaded. A ramp bar urges the front-end chassis of the ATV upward as the ATV's rear wheels are guided up the bi-stable ramp, and a front-end chassis support frame supports the front-end chassis of the ATV when loaded. The trailer includes a trailer hitch assembly that is attachable to a towing vehicle.

Abstract: A trailer is disclosed for conveniently loading and transporting a four wheel vehicle, such as an ATV. An ATV or other four-wheel vehicle can be loaded onto the trailer by being driven onto the trailer without requiring an additional ramp. Furthermore, the trailer is compact and uses less material than standard utility trailers, thereby reducing production cost, storage space, and gross weight. The trailer includes a bi-stable interactive ramp, a support bar enabling the ramp to tilt about the support bar's axis, a rear-wheels support frame for supporting the rear wheels of the ATV when loaded, a trailer wheel assembly, a ramp bar for urging the front-end chassis of the ATV upward as the ATV's rear wheels are guided up the ramp, a front-end chassis support frame for supporting the front-end chassis of the ATV when loaded, and a trailer hitch assembly attachable to a towing vehicle.