Patent ID: 8251385

Claim:
A vehicle comprising: a) a chassis framework supporting a body and comprising first and second longitudinal frame sections, wherein said first and second longitudinal frame sections extend in substantially parallel relation to each other, wherein said first and second longitudinal frame sections are coupled to said body, wherein a first pivot axle couples said first and second longitudinal frame sections together to permit laterally offset fore and aft ends of said first and second longitudinal frame sections to pivot independent of each other and said body; b) a plurality of drive axles mounted to transversely extend from the fore and aft ends of said first and second longitudinal frame sections; c) first and second cross frame sections extending between laterally opposed displaced portions of said first and second longitudinal frame sections, wherein a plurality of pivot couplers couple the ends of the first and second cross frame sections to pivot at the coupling points to said first and second longitudinal frame sections, and first and second torsion couplers mounted to said first and second cross frame sections and coupled to said body, and including torsion means for resiliently resisting and torsionally biasing rotation of each of said first and second cross frame sections relative to said body to an equilibrium position; and d) a plurality of rotating members coupled to pivot about each of said drive axles to support said chassis framework and body, and including means for resiliently biasing each rotating member to an equilibrium position relative to said first and second longitudinal frame sections, whereby each rotating member is able to resiliently pivot relative to the first and second longitudinal frame sections and independent of movement of the first and second cross frame sections and the first and second longitudinal frame sections upon encountering changing terrain contours to maintain a horizontal orientation of said body relative to the terrain.