Those wheels will not work, they are intended for late model ('99 and up) trucks. The backspace is too deep, unless you're planning to run 1 to 1 1/2" spacer. Also, there would be a concern over the load capacity of the tires. Most of the 20" tires on the market are intended for passenger car or 1/2 ton truck use, they will not hold up under a 3/4 or 1 ton for very long.
