What are the biggest tires you can run on one of these stock? Also what would be good backspacing for a new set of wheels for this. I'd kinda like to run 33x12.50x15's on it.

Eventually I would like to lift it up 4" an run 35's.

What do you guys think?

 

I'm pretty sure the biggest you can run with the stock 4x4 height is 33in', I'm pretty sure the widest you can go w/out rubbing would be 10.5. I think stock the wheels have a 4in backspacing and if you wanna run 12.5 on a stock height w/out any rubbing you'd probly wanna run with almost a 3in backspacing...keep in mind the less back space the more wear your bearings will receive.