Propane fridges are the #1 cause of rv fires.
12v fridges (big coolers) arb,engle etc are the cats meow but at $700+ for a small one way out of my pants.
For our use we need a fridge (to keep my milk cold
and everything else ) for the "drive" to where we go and either plug in or fire up genny.
So a couple 6v 215ah batteries,solar panels and the alt will keep a power inverter running between plug ins.
Your situation,involves some math to calculate how much power you need vs how to supply such power...tricky science but not bad....