ok heres the thing
you are in a cold climate..put that tank on the outside in the winter and your heat will suffer slightly...propane needs to evaporate into gas to fire the burners...if its cold it dont evaporate well
if its in a VAN then yes i would be leary...in my box truck i have them in there...other side of the burner, and my truck gets mostly shut, so as to keep the heat in the truck...
the thing i learned....is they have a protection built into the valve.....if its a sudden leak and you loose a bunch of gas (which would cause the boom) the valve shuts down and only allows a trickle of gas out...so as i said before....unless you stupidio it shouldnt have a problem...
remember...this is if you DO NOT shut your van/box up all nice and tight..
i leave about 5" open on the back door, and sometimes the side wide open, or with about 5" open there to...
its the build up of gas that causes the issue