Yep. We put bicycle locks thru the “ punch button” ,shaft hole so no one could open door when we parked. Slamming door most often got the hand opener inside to lock door. . Especially while “on tour” as we said. Prior to deregulation of transportation, we also did long distance charter work anywhere a group wanted to go besides “regular runs” within yellowstone. Once with a group of Australians, we pulled up to the entrance to Zion, and the ranger gave a quizzical look, and asked me if i was lost, entering Zion not Yellowstone. My group was in uproar laighing