Not familiar with the 4 door model but the 2 door has a switch to run on propane regardless of whether or not you are plugged in or on genny power. In the top right I see what appears to be a thermometer. If so, you have 12v power so the fridge should power up on propane. Note: There are things that need to be checked if it does not. Please post your progress.
Welcome to Lake Wobegon where Justin and David utilize abductive reasoning to help solve F/SS issues.
Happy Trails and Remember the Pequod.