Abstract: A drive-over conveyor for unloading fracking sand is designed to be towed as a highway semi-trailer includes a center frame structure containing a conveyor belt with two pivotal ramps on each side to be moved to a raised position standing upwardly and a lowered position extending outwardly. The ramps have sufficient length and the center structure has a low height to allow a highway semi-trailer to pass over a grate in the center structure. A platform is attached at the forward end with a king pin on the underside for engaging a towing platform of a highway tractor. A wheel and axle assembly including suspension of the axle for highway travel is mounted on a sub-frame pivotal relative to main rear frame for movement relative to the center frame structure from a lowered road position to a raised position allowing the center frame structure to rest on the ground.