I've learned from experience that if anyone wants to steal a stand, they will. They will always find a way to pick the lock or cut the chain. And no chain or lock is impossible to pick or cut. If it's a climber, I would bring it in and out of the woods. If it's a ladder stand or one that must be left it the woods, I would use at least two chains, so if someone decides to steal it, they are going to have to work for it.