It would help if you posted make and model number of fridge.
Since you left the trailer unplugged and the fridge needs 12v for the electronics, is the battery fully charged?
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package