Here is the truck:
The lift is all spring (8"), but I would do the shackle 4-inch combo if I did it again. My tires are 38.5 inch Swamper SX's, which really measured around 36.5 inches tall when they were new. Keep in mind I have Bushwacker flares, which involved cutting the fender openings longer, so it makes the tires look smaller.
If you go with 35's or larger, the stock axles would be okay for "light" wheeling. Never get on it on pavement or rocks, though, or they will snap. Mud? Loose sloppy stuff I suppose would be okay.