Jim, can you please expound on your statement that there is an automatic propane shutoff when you turn off the engine. Since your trailer has it's own onboard 12 volt supply (battery/batteries) the trailer's electrical system operates independently of the tow vechile. I assume that when you turn off the power to the fridge or choose the electric only mode that a valve to the burner closes. Propane, however would still be supplied to that valve. The only way to completely turn off the propane to any of the appliances is to manually close the valves on the two tanks and then purge the lines of any residue pressure.
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2015 3100RL legacy...2005 Ford F-250 CC SB. Tows like a charm! 4/19 Updated to 2017 Chevy 3500 CC SB SRW -hope it tows as well as my F 250 did!
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