I'm not talking LPG transport trucks, I am talking the fuel used to send them down the road is LPG or compressed natural gas (CNG) These were gasoline powered trucks that have been converted to run on LPG or CNG.
Fact still remains that 134a when mixed with the oil in the system and vented in a collision would still have the same potential of fire. MSDS sheets have warnings of venting 134a under pressure into an O2 environment with an ignition source such as a spark.
Also was not questioning your technical knowledge about machines with the farmer remark. No such thing as a stupid farmer, I grew up in the family business of tobacco and beef with all the machines needed to do that. When I was little we also grew bluegrass for seed. Must be something in the genes of grass farmers that makes them opinionated

enjoy that boiled chicken Bill