Since people do not care to research the issue, here is a simple version of what can happen with a slightly overfilled tank and THIS has happened and documented. A lot of RV'er transport 20 or 30 lb DOT tanks in there Motorhome or Towable(usually 5th wheels) storage. So, it is 70 degrees when filled and they overfill the DOT tank and you throw it in the RV and take off. You go to a climate that is 95 plus and camp out. The interior storage heats up and the LP heats up. Then its system blow out valve opens and spews LIQUID LP inside your RV. What happens when that LP reaches an Ignition source? There are lots of them inside and up in a RV. Most would blame the Norcold 1200 refer if it had one:B Same thing can happen in your enclosed Pick up bed or the trunk or interior of your car. I have seen enough REAL evidence in 40 years that I believe what Texas mandates and what we practice is the BEST way to handle LP. Doug