The front axle still spins freely with CDL unlocked. Possibly a good bit of damage if it were locked and towed on just one of the axles.Yeah, that's a fair point. I actually always set the parking brake and rest the weight of the car (any car I am parking) on the parking brake with the car in neutral, then shift it into park. My thinking is that keeps the weight of the vehicle on the parking brake rather than the trans. But your point is well taken.
If the trans is in park, though, and the transfer case is in neutral, doesn't the neutral safety switch still prevent shifting the trans out of park without the key? And you can't remove the key with the trans in neutral, can you? I could be wrong about all that.
No good solution when it comes to that level of determination and a secure garage or indoor storage isn't available.