Brand new old truck (to me)

[DDT]

I got a 04 quad cab,SB, 6 speed transmission with 84K on it. While I need some time to save up for guages and chip. I would like to figure out what I need. I had a 03 with a quadzilla 100 HP box in cab adjustable, I really like it. But I see now there not making the same box? The reason I like it so much, setting#1 stock #2 30hp (timming only) better mileage and my favorite. #3 60hp I pull GN trailers and the extra power passing is nice, and #4 100HP WOW go fast and blow smoke. Any suggestions what to look for my 04?

Thanks

DDT