Abstract: A vehicle adapted to traverse uneven terrain, comprising a chassis and a plurality of wheel assemblies. The wheel assemblies each comprise a forward wheel and a rear wheel mounted on a common support structure. The support structure is supported for free pivotal movement on the chassis about a pivot axis located between the forward and rear wheels and is constructed and arranged such that the forward wheel of each wheel assembly supports less weight of the vehicle than the rear wheel of the respective wheel assembly. A stopper arrangement, which can take a variety of forms, is provided for limiting the pivotal movement of the support structures of each wheel assembly about the pivot axis. The stopper arrangement is adjustable for changing a range of free pivotal movement of the respective support structure. The vehicle can be a towed trailer-type vehicle with a wheel assembly on both sides, or a self-propelled vehicle with a wheel assembly located at each corner of the vehicle.

Abstract: Soft low pressure type trailer wheels are supported on inverted V-shaped wheel tandem-type support members. Each of the wheel support members is pivotally supported on a side of the trailer and arranged such that the front wheels are supported about twice as far ahead of the pivot axis as the rear wheels are supported behind the axis. The pivot axis is arranged in the vicinity of the pivot point of the trailer. With this arrangement the front wheels may readily ascend a slope while "cranking" the rear wheels downwardly using the mechanical advantage provided by the longer forward support portions of the wheel support members. This tends to maintain the trailer relatively level. The arches provided by the inverted V-shaped wheel support members also provide sufficient ground clearance that the tops of the soft walled levees or the like type of undulations over which the trailer is towed, are not damaged to any extent.