It's a body on ladder frame design, with solid rear axle, IFS, and 2 speed transfer case. The whole package comes in under 3100lbs for the 4 door model, and much lighter for the 2 door. There's not alot of aftermarket support, but theres enough to build a modest off roader. Locking diffs and LSD's are available front and rear. Spacer lifts, body lifts, and springs are available as well. A Chevy Tracker is nothing more than a Suzuki Grand Vitara with a bowtie on the grille, so alot of other Suzuki stuff transfers over, like my XL7 3rd member. As far as thier off road capacity, I can't speak from experience just yet, but in my neck of the woods, when a Tracker is too rusty to pass state inspection, it usually ends up as a woods buggy chasing UTV's through the woods. And most of those are stock, so I'd say they go pretty good.