Wheeled vehicle for distributing agricultural materials in fields having uneven terrain

A self-propelled vehicle adapted to traverse uneven terrain, comprising:

• a chassis;
• first, second, third, and fourth wheel assemblies for supporting said chassis, each wheel assembly comprising a forward wheel and a rear wheel, and a support structure on which said forward wheel and said rear wheel are rotatably mounted, said support structure being pivotally supported on said chassis about a pivot axis located between said forward and rear wheels;
• said support structure of each wheel assembly being 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 when the vehicle is traversing level terrain, and vertical movement of one of the forward wheel and the rear wheel induces synchronous movement in the other of the forward wheel and the rear wheel.

A self-propelled vehicle adapted to traverse uneven terrain, comprising:

• a chassis;
• first, second, third, and fourth wheel assemblies for supporting said chassis, each wheel assembly comprising a forward wheel and a rear wheel, and a support structure on which said forward wheel and said rear wheel are rotatably mounted, said support structure being pivotally supported on said chassis about a pivot axis located between said forward and rear wheels, said support structure of each wheel assembly being constructed and arranged such that vertical movement of one of the forward wheel and the rear wheel induces synchronous movement in the other of the forward wheel and the rear wheel;
• said support structure for each wheel assembly being unbiased so as to permit free pivotal movement of each wheel assembly, each wheel assembly further comprising a limit means for limiting the free pivotal movement of the respective support structure to within a predetermined range.