Kerbal Space Program

I created a plane that turned into a rover with a mobile processing lab and several RoveMax Model 1 wheels. The first crash happened after I detached some parts, drove off the runway, and destroyed the lab, but not the wheels. I reverted the flight and the game crashed. The second crash happened after I parachuted down to a mountain. Again the lab was destroyed, but not the wheels. The game crashed on revert again. The design of the plane was modified between the crashes. I have reverted many flights (thank you for that feature, by the way) without issue, so I suspect the problem is with the wheels.