[bushpilot]

bummer but still went to a good home.

I'd use silicone sealant (thats what the mfg used) it won't attract water like the foam may.
You might want to use some thompsons water seal or something on the exposed (to the exterior) wood & then just insulate (blue foam board insulation?) the hole and leave the factor vent cover in place.

How many watts does that fridge consume?
I'll be curious to hear your experience / battery run time when dry camping.

I think while traveling you're fine, if your coach is like ours, where the engine alternator charges the house batteries.

My guess is you'll be hunting for some solar panels and a charger to help you keep those batteries topped up during the day so you can avoid the generator run time.