GMCFAN,
AS OTHERS ABOVE, BRING THE TIRE/WHEEL ASSEMBLIES TO A TIRE SHOP. THERE THEY WILL BE ABLE TO CHECK THE FIT OF YOUR NEWLY DONATED ITEMS.
THINGS THAT WILL CREATE PROBLEMS ARE: OFFSET OF WHEEL/TIRE COMBO CAUSING THE TIRES TO RUB ON FRAME OR FENDER, RPMS TOO HIGH(OR LOW) FOR THE ENGINE TO REV CORRECTLY, CLEARANCE IN BACK IF THE BED IS LOADED HEAVY.
REMEMBER, IF THE RIMS ARE TOO NARROW FOR THE TIRES, ALL THE TIRES WILL DO IS WEAR FAST IN THE CENTER. GOOD LUCK
