First of all, welcome to the TDR.
I have the Skyjacker 2. 5" coils up front, and add-a-leafs in the rear. I'm running 305/70's, which are 33/12. 5" sized tires.
I like the coils, but you'll need to get longer shocks, and probably a longer trackbar like the DT tracbar. This will keep your axle centered under the truck.
The only thing about add-a-leafs is that they make the ride stiffer and the overload leaves don't have the same arch as the rest of the spring pack, so they might not work as well. I also replaced the factory 4. 5" lift blocks with shorter 2. 5~3" ones, so I got close to 2" lift in the rear.
Maybe someone will have some different ideas.
Brian