Here's the deal. I've now broken two chassis right in half - one on my Rustler VXL and one on my son's 2WD Slash. Well, not in half, but they broke apart squarely where the rear meets the rest of the chassis. One was definitely understandable, kids were jumping the cars off of skate ramps, bad idea.
The slash though just broke. I'm sure it was bound to happen with the way my son drives.
Anyway, I just bought the full chassis skids for both cars. Think this will help?