Camper explosion

On my first trip with my old Star Craft Gemini camper we could have used a LP detector. Quality control let our camper get through without checking to see if all the propane fittings were tight. We set up camp after arriving late, turned on the furnace, and went straight to bed. The furnace kept going out and restarting and I finally just turned it off. Woke up about 5:00 (my normal wake up time)and smelled propane REALLY strong! (The Star Craft has a slide out bunk that is right over top of the propane tanks.) I got up and turned the tank valves off and waited for daylight to try to find the leak. Turned out that an entire tank of propane had leaked out during the night and the auto switch over valve had started on the second tank! The low pressure must have been what was causing the furnace to keep going off. Once it was light, I found that the main fitting after the regulator was loose! Could have been a lot worse....