Good looking truck you got there. If your not afraid to cut some fenders, then you can fit the 38's with just a 4 inch suspension lift. I strongly advise against body lifts that are over 1" tall. They do nothing for you except lift your center of gravity, which is never a good thing. Granted, a suspension lift heightens your center of gravity too, but you gain flex which helps in tipsy situations more often than not. Im running 37's on about a 4 inch lift, and had to cut some off my fenders. They do fit though. One guy on here was running 42's on a 2" lift. I guess it just depends on if you want to cut any or not. If not, I would suggest a 6" suspension lift and maybe a 1" body but only if you have to.
-Harrison