I'd suggest you take a tape measure and do some research next time you see a 'late' 1-ton. Especially the four-wheel-drive ones. The track width is a lot wider than what an AD truck is really set up for.
Building mounts for what you descibe has been done, I've seen pictures. Also it would not be much different than what is done on the more common S-10 frame swaps, so looking at pictures of those might give you some ideas.
The differences between a 3/4-ton, 1-ton single wheel, and a 1-ton dually are not real great. You might broaden your search a little if your load demands are not great. The dually front hubs and brakes are not real hard to find and aside from the wheels that's the real difference between a dually and a single wheel truck.
