Suburban doesn't have enough power to take the mild tire size increase?

Seems like 33's is the cap on most off-road type vehicles before you really start having to modify stuff. I heard newer full size trucks can fit 37's now.

My Amigo could handle 33's but I'd really have to regear, especially since it's an auto (and a crappy one at that). But I'm thinking of selling it and getting something a bit bigger and possibly going even larger on the next thing. If it were only like $500 an axle, I'd go ahead and re-gear and get some lockers (not included in the $500), but if it's going to be $1,000-$1,500 just to regear each axle, then I might as well pick a platform and go hog wild from the get go.