For you Propane experts. There was a RV-Bus that caught fire. The bus was covered on the sides all the way down to 3 ft off the ground with 3 X 20 tin sheets. At the time of the exam the side windows were noted 16 ft to the side of the bus and had come through the tin dislodging it from the framework. The two front windshields blown out cracked but intact and were measured at 122 feet out in font of the bus and were clear with no soot on them. The question I have for y'all is this, there were 3 small camp propane bottles the type you use with a table top grill stored down in the luggage compartment under the bus or otherwise known as the basement. Can one of those bottles get Propane up in the bus enough to blow windows 122. The floor of the bus was about 24 inches from the top of the bottles. Yes we should know Propane is heaver than air and it you don't know that you should not be responding to this thread. Now What say you and don't over think this please. Oh the bus was 45 feet long by the way and had about 382 Sq ft This bus does not have an on board Propane system just to let you know.