Actually, considering most, if not all panels (depending on model) are aluminium, there is very little rust. Only corrosion between the steel frames and the ally skin.
The "self lubricating chassis" setup, (otherwise known as major oil leaks in the diffs, gearbox, transfer case and engine.....oh, and power steering
) tends to keep the rest at bay.
Am a member of
www.aulro.com and they are a great bunch of guys & gals too. A few have an interest in subs, so I'm trying subtly to direct them over to subsim at the same time.