Tongo, There are several manufacturers of adapters that take the 8 lug Chevy bolt pattern to the semi big 10 lug bolt pattern. I am using American Force adapters on my ride, and they are built like a tank! Their website is:
http://americanforcewheels.com . Do you plan on lowering your truck, or are you going to keep it stock height? The reason I ask is that with the stock 1 ton rear end the semi wheels will stick out past the fenders by quite a bit. If you plan on lowering it then you will either need to shorten your stock axle, get a cab and chassis axle (which is shorten from the factory), or use a 3/4 ton rear end from a suburban. If you use the 3/4 ton rear you will still have to get the rims face milled 3/8" on each rim in order to tuck it inside your fender like my ride.
Hope all this helps you some. Let me know if you have other questions. Good luck it looks like a nice ride!