Hi Jacka, I'm gonna have to differ with ya, sorry. The 2 way refer is
designed to operate on propane or 110 volt, the 3 ways are made for
propane, 110 volt, and 12 volt. Like you said the 12volt is not very
effecient and a battery eater if the engine is shut off. They were
designed to cool down on either gas or 110 then when traveling the 12
volt was supposed to help maintain the temp until you were able to
plug back in or light the gas, it would help as long as you didn't
open the door too many times. Most people run on propane while
traveling then 110 volt while parked where you have 110 v access.
Theres some safety factors associated with running the propane while
driving but thats for the operator to decide :)


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