Probably the "thought I was braking, but really floored the gas pedal" problem.
The picture of this, and other, stick built MH's make me more convinced than ever, that buying an older Bluebird Wanderlodge was the correct decision. Built on a crash certified, all steel body and frame. Bluebirds have rolled onto their side, been pulled back upright, and driven off.
The extent to which regular RV's literally self destruct in relatively minor accidents, is appalling.