Most likely the fridge is on a GFCI in the trailer... Plugging the extension cord into a GFCI can sometimes cause problem... GFCI don't like being in a chain...
https://diy.stackexchange.com/questi...er-gfci-outlet
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2015 Ford F350 DRW 6.7 Diesel XL
2020 Avalanche 313 RS
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