Abstract: An off-highway dump vehicle of the bottom-dump, two axle type having a single wheel in all positions; an A-frame front suspension which provides large steering angles for the vehicle wheels; an A-frame rear suspension system separate from the front suspension system; a dual braking system comprising primary and secondary brakes actuated by a common brake pedal and arranged wherein the secondary brakes are automatically actuated upon failure of the primary brakes for any reason; the vehicle structural elements being pinned together for facilitating assembly and disassembly thereof for shipment of the vehicle to the site of operation thereof; the vehicle load in the rear is carried directly on torque tubes and the front load is cantilevered from the torque tubes; the vehicle deck is a "floating" type structure in that the only elements carried by the deck are the fluid lines for the braking system, steering system, and the like; the access door to the axle box is of a self-closing construction in that air press

Abstract: Door opening and closing apparatus for actuation of the doors of a bottom dump type vehicle, said apparatus comprising a common linkage mechanism operable by a single power means for simultaneous and synchronized opening of the doors whereby emptying of the contents of the dump body is facilitated. In addition, a transversely extending centrally disposed partition is provided in the dump body for distributing the load of material accumulating in the dump body in a manner for substantially equalizing the load stress on the vehicle.

Abstract: A self-propelled floor jack for intermittently lifting substantially great loads and comprising base element means supported by propelling wheel means, lift means selectively engagable with the load, positive-lock pawl and ratchet means cooperating with the lift means for locking thereof in preselected elevated positions, bell crank and lever means operably connected with the lift means for determining the travel path therefor, and steering and control means operable for propelling and actuating the apparatus.