1. A MODULAR VEHICLE FOR TRANSPORTING BULK MATERIALS COMPRISING A PAIR OF SPACED PARALLEL ELONGATED LONGITUDINALLY DISPOSED WHEEL WELL COVERS HAVING A CLOSED TOP PORTION AND AN OPEN BOTTOM PORTION AND TRUSS SIDE PORTIONS, A FLAT BED SUPPORT AREA CONNECTING THE WHEEL WELL COVERS AND BEING FLANKED THEREBY, A PLURALITY OF ROTATABLE WHEELS MOUNTED WITHIN EACH WHEEL WELL COVER, EACH WHEEL HAVING A PNEUMATIC INFATABLE TIRE MOUNTED THEREON, EACH OF SAID TIRES WHEN FULLY INFLATED EXTENDING THROUGH THE OPEN BOTTOM PORTION OF THE WHEEL WELL COVER A PREDETERMINED AMOUNT FOR CONTACT WITH A PLANAR SUPPORTING SURFACE SO THAT SAID VEHICLE IS SUPPORTED ON SAID PLANER SURFACE ENTIRELY BY SAID PNEUMATIC TIRES WHEN SAID PNEUMATIC TIRES ARE INFLATED, MEANS TO SIMULTANEOUSLY CONTROL THE PRESSURE OF FLUID IN ALL OF SAID TIRES AT PREDETERMINED TIMES TO EITHER INFLATE SAID TIRES TO CAUSE SAID VEHICLE TO BE SUPPORTED SOLEY BY SAID TIRES TO CAUSE SAID VEHICLE TO BE SUPPORTED WARD MOVEMENT OF THE VEHICLE SO THAT THE BOTTOM PORTIONS OF THE WHEEL WELL COVERS ARE IN CONTACT WITH THE PLANAR SURFACE TO SUPPORT THE VEHICLE IN FIXED POSITION THEREON, SAID MEANS FOR INFLATING AND DEFLATING SAID TIRES COMPRISING FLUID PRESSURE SUPPLY MEANS CONNECTED TO A CENTRALLY LOCATED VALVE MEANS, PRESSURE LINES EXTENDING FROM SAID VALVE MEANS WITHIN AN AIR CONDUIT HOUSING LOCATED ON THE EXTERIOR SIDE OF EACH ELONGATED WHEEL WALL COVER, A ROTARY COUPLING ALIGNED WITH THE CENTER OF EACH WHEEL AND CONNECTED TO SAID PRESSURE LINE, AND AN AIR SUPPLY HOSE CONNECTION MEANS EXTENDING BETWEEN SAID ROTARY COUPLING AND A VALVE STEM ON EACH WHEEL TO ENABLE INGRESS AND ENGRESS OF PNEUMATIC FLUID WITHIN EACH TIRE TO ENABLE INFLATION AND DEFLATION THEREOF.