I've been more daring and running mine off curbs lately, HA. Because the suspension bottoms out so easily, the chassis really takes the hit. I'll run it up to 30 mph and fly off the curb. It lands flat, just sparks a lot. Last time I went out, my friend put his car against the curb and I jumped it, but it caught something and cartwheeled a dozen times, but nothing broke.
Even before I started beating on it, I noticed hard hits will start to slightly bend the front of the chassis up... like kick up on a stadium truck.
Everytime I go out now, I either have to take my dremel and notch new slits in my engine mount screws or replace them because they get ground off.