Oreo nut. I feel bad you were duped into this “new” technology. My response above was not directed at you whatsoever.
But at this point, even if your new camper has 2 rv dealer Walmart special batteries in it, you will have to watch how much you’re draining the batteries closely.
Effectively taking away from the convenience and ease of old 2 way or 3 way absorption refrigerators.
Imo best move now, short of returning the camper or changing the fridge, is get ya some decent battery reserve capacity and maybe put a dc dc charger on the truck to keep ‘em up during travel.
You could always run a generator in the back of the truck and duck tape the power cord to the camper as well.
If you don’t do something you will probably need to babysit the fridge during all them extended periods when it can’t be hooked to shore power.
Sorry to hear of your troubles.