You ever angle through a ditch and plow the front bumper or drive over a terrace and belly out? That is the kind of things guys avoid with a lift. I was never a big fan of body lifts due to the leverage the body has on the mounts. One thing they do for the truck though, is keep the chassis/engine/transmission weight down and still give more tire room. They also do not affect driveline angles. I always preferred the milder chassis lifts. Knock them as we may, the guys running big lifts, body lifts and monster tires, sure make climbing the rock ledges look easy. They suck on the sidehills, but going over a four foot tall rock, which is impossible without big tires/lift, sure looks easy sometimes.
I prefer my M1008 just the way it is, maybe a little taller tire. Same for the M1009, nice road vehicle that can handle some rough stuff. It is all a matter of personal preference. Some places you flat cannot go with stock suspension and/or tire height. My brother loves to bang away at the rocks, I tell him I really do not need to go there. I built a Kaiser M715 and did a lock of rock climbing and crawling around with it, it was pretty versatile for as stiffly as it was sprung. Glen