I did the same in the front as others have suggested with the 5100's. I had the rear leaf TSB installed by the dealer which upgraded the factory 3 leaf spring to a 4 leaf.
I went ahead and purchased the 5100 4 shock package from "Downsouth" '''they were the best price when I was shopping. They are set @ 1.75
Downsouth Motorsports - Click Here
After the lift I was able to fit a 265/75/R16 (31.5 x 10.5) tire with no rubbing and the truck sits nice and level when towing my boat. I am really happy with the way it rides....drives straight with no vibrations. Installing the 5100's did require an alignment afterwards.