I hope I don't offend too many people here, but I am using the Avalanche drivetrain and chassis, but not the body. Rockers are rusty, but doors are mint - msg me if you need any parts. I have a 55 Chevy truck that I will be putting on this frame.
I originally bought it for the engine, but realized it has the exact same wheelbase so I thought it would be cool to make it 4WD and still be able to tow my trailers. I do plan on towing. This one has the 4.10's so I think it's rated for 12,000 on the hitch. I might be putting in a fifth wheel as well.
I did look at the Ridetech HD 4 link and will probably go with that eventually. Should improve the ride also.
I also have an 04 2500HD DMax and it looks like the front end parts are almost identical.
As far as wheels, I plan on installing duals in the rear and matching the fronts with the dually spacers.