I carry a 3 pound tank inside the van as an emergency back-up for my
catylictic heater (exhausts to the outside) that runs off of the external
propane. I travel in the winter and need the furnace but I have to guess
how much fuel is in the outside tank. Hence, I had a flexible tube made
with appropriate connection so that I can use the backup in an emergency. I
carry the small tank under the rear seat and am not worried about it. The
possibility that I will be involved in a servere crash and that the backup
tank will be burst is very unlikely.

Dan R.