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There is nothing automatic about our 1998, 3-way Dometic. The fridge has been (knock on wood) trouble free on any of the 3 ways to cool. I try to park in the most level attitude I can find, and for sleeping have the head end slightly uphill.
In the beginning I ran the fridge on 12v. since the propane flame would blow out above 50 mph regardless of wind conditions. On a long trip this put a lot of stress (aka amp draw) on my 125 alternator. On propane it just sips fuel. My local RV guru told me to fill in about half or a bit more of aluminum flashing to the front vertical part behind the fridge plastic vent and, voila! we run the fridge on propane the entire time we’re out now, 24 hrs. a day. If we don’t run the heater we can get a couple weeks out of a tank. It will not blow out, regardless of wind or speed. Recently the push button igniter return spring failed to spring back so I had dig behind the vent to light the pilot manually by pulling back some metal guards to get to the pilot orifice. Just one more non-automatic chore that I must do before heading out…until I can get the igniter replaced. I only turn off the fridge if we are refilling the propane tank on the road. Ah, the trials of a rolling relic of the last millennium.

2020 Ford F-350 XLT FX4 4WD SRW SB SC 7.3L Godzilla Gas TorqShift 10R140 397 amps dual Alt dual batts Frnt Dana 60; Rr Dana M275 E-locker 4.30's 4580/4320/4066# payload 7243# curb wt. 11,300# GVWR 5-er prepped. 2020 Northstar Laredo SC, 12v compressor fridge, cassette, 320w Solar sub zero insulation.