My own bad on this but we were running shuttles at Vedder in my truck. Taking turns driving. The guy driving the last run of the day decided to go fast to beat us on the way down and I now need to have my front diff done. You can actually see where it hit a rock from compression. Not happy, but lesson learned. No one drives my truck but me. You can't take a turn shuttling or recovery in YOUR vehicle, you are not driving mine.
i'd say he needs to pay for your truck getting fixed.
We don't know what our limits are, so to start something with the idea of being limited actually ends up limiting us.
Ellen Langer