If the tank swelled (from turboflushing with the waste gate closed, over filled and let sit in the heat, etc) it is possible for the supporting structure to bend, break, and release the tank. Some campers have pretty minimal cross braces.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW