Just came across this information. "Always store tanks in an upright position. That's because the top of the tank is where the pressure relief valves are located. When upright, if excessive pressure builds up, these valves will pop and bleed vapor off. While this is not good, it is not as bad as the consequences of having the tanks resting on their sides. In that position, the safety valves would bleed off raw liquid propane.
2013 Surveyor SVF 293
2013 Ford SD F250 4x4 SC; 6.2 EFI V8
Reese 18K Elite w/slider - Ada, Michigan