not going up. Well not in tire size but I am in wheel size.
I found a set of Michelin LTX's with only 8k miles on them for $400!
I really just wanted to go up to 17" wheels so that I could do larger calipers and brakes on my truck. I can do a full 3rd gen swap on wheels, calipers, rotors, and brakes and have more stopping power on my 2nd gen dodge now that I'll have 17" wheels.
I figured while I was at it, I could do 285 tires but honestly I really like how my set up is. I really think it's ideal gearing, tuning, & tire size now. I am making about 350hp on my 6 speed cummins and it pulls nicely. Don't want to screw with it or the camper.