Guess I'm gonna have to look it up in the hazmat book to see which one is more explosive, as in the case of a pressurized tank of R134A, R12, or Propane. I do know that Propane being transported requires placards and is a HazMat load. I also know that over so many cans of refrigerant, and it has to be treated as hasmat, therefore, most shippers now break up the volume, ship them separately, so it doesn't have to be treated as hazmat. I suspect, without having the book in front of me, that propane is the least of DOT's worries.

Oooops, can't find the book, is obviously in my glove box in the Peterbilt parked 10 miles away.

However, a hazmat placard, to my knowledge is not required for the 5-gal tanks on RVs, so I would imagine that DOT doesn't consider that little propane to be a hazard. I also agree with an earlier statement that any piercing of condensor would result in an immediate escape before it would have a chance to catch fire. Also, gas requires a flame or spark to flame up, no just a cigarette head glowing . . . LOL. Also, even if the entire load of 2.5 lbs escaped into the passenger compartment, there are enough escapes for the gas to find, especially if a window is open, thereby, not causing any measurable risk.

But, this has been a fun read, if nothing else!!!!

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002