One of the problems in school bus conversions is how to lock the rear door. Bruce on Yahoo Shoolie Group
used a dead bolt lock on the rear door of his school bus conversion and I liked the idea so much I kidnapped it and expounded on it.
While I loved Bruce's idea, I have a hard time just doing things simple. Also, this is my second school bus conversion. When I did the first one I had a combination/key lock then also. It was a manual combination lock. The main reason I opted for that type of lock was if I were camping and wanted to go swimming or just didn't want to have to take keys with me I could just dial in the combination and open the door. Nothing like losing your keys at the beach or the pool and can't get back into the house/camper.