Seriously? You are actually worried about a full size truck "flipping"? Then go out and buy nice low riding sedan and let me know who fares the worst when your 3000 lb car collides with an 8000 lb truck. I know what I'd rather be in. Also, I've never left my rig with any minimum wage anybody. Develop some skills and ability to work on your own vehicles. If you are silly enough to leave your rig with a bunch of knuckle heads, then I don't feel too sorry for either the drivers that damaged the rig or the owner in this case.
BTW, track cars can flip if they catch an edge between sections of concrete. Curbs are even better at flipping vehicles. It's best to avoid hitting them in the first place.