I have seen salesmen trash used Hummers at Happenings. Then everyone follows and does the same thing. Probably not good. I think bjc is very correct in his assesment. Spotting can be very bad, and damage is likely if you're not being sensible. There's a certain local dealer who I know says the H3 steps can stay on but not the H2 steps because the H3 chrome steps "don't hang lower than the frame".
When I was there last, they had a "new" H3 in the showroom that had a bent tube step on it. I don't know if they just didn't see this or what. But whatever. I try to stay far, far away from the dealership.