Tinstar,I can understand how this kind of thing happens because something similar happened to me about 8 years ago when crossing from Canada back to the US. I was slowly going over railroad tracks and I thought I smelled propane,actually my wife smelled it. When I got out I heard a loud hissing leak which I thought was a propane leak. When I looked closer it was my tire with a large bolt sticking out of it and leaking fast. By the time I got the plug kit and inflater out it was almost flat. After plugging the hole and inflating it to about 40 psi with my HF air pump I slowly drove to a gas station to top it off. I never noticed the low tire or hissing noise from inside the MH. I am sure the tire would have been in shreds if my wife didn't smell something.