AdequateRV wrote:
Is there a higher probability of it slipping into gear when it is running vs not running? If it slips into gear, is the damage more or less severe when running vs not running?
There's certainly a lot bigger risk of damage from slipping into gear when running and being towed for down vs. slipping into gear when not running and being towed on a dolly.
For towing four down, where one would be in neutral (I assume) in either case, I would guess it's not much different for a mechanically controlled transmission. For an electronically controlled one, if the engine is not running it may not actually shift the transmission into gear since the computer, and not the physical shift lever, is actually making things happen in the transmission. It also may shift it regardless, if the key is on and the computer is so programmed.
Backing up too much with the transmission in drive would be a bad idea, but backing up when towing four down is a bad idea in any case, so that's a moot concern.