3/4 ton to 1 ton ?'s

[bagged01extcab]

I recently bought a 86 crew cab 3/4 ton and have been thinking about changing it over to a duall wheel 1 ton. It has the heavy duty 14 bolt ff rear. What parts will I need to change the suspension to the dual 1 ton wheels in the rear, and the 1 ton front wheels? I want to run the rear dually fenders, so the parts need to be for that, not a cab and chassis. Correct me if I'm wrong, but a cab and chassis rear wheels don't stick out as far as a duall wheel dually.

Thanks
Trey