Patent ID: 7021720

Claim:
A vehicle comprising: a chassis having a top and a bottom; a front and rear drive assembly combined with the chassis, each drive assembly having a hub and a plurality of lugs which protrude from the hub, the front drive assembly being steerable; a front and rear transport system combined with the chassis, each transport system having retractable wheels which retract with respect to the chassis, the front transport system's wheels being steerable; an energy source for powering the drive assemblies and the transport systems; wherein the lugs are soil-penetrating lugs made of steel; wherein the lugs protrude at least three inches from the hub and are offset from each other along the length of the hub so that each lug penetrates the soil at a different point; and wherein the lugs are mounted onto the hub with springs so as to dispel rocks and in a pattern so that a plurality of lugs form a line of lugs extending across a width of the hub.