clickyIn general these rigs are expected to spend most of the time at full hook-up campsites.
Not a lot of info on the website about batteries/solar/generator etc. but the FR website says 4 house batteries and a 2000 watt invereter. I expect it has a 6kw genset. So the answer is yes, you are okay for a few days at a national park with no hookups. 50 gallons of fresh water space will make it tight unless you take Navy showers.
If that's a residential fridge ( runs only on 120 VAC ), you'll need to leave the inverter running all the time. When on the road, the engine should charge the batteries. Dry camping, you'll be sucking down the batteries. If you limit your dry camping t a couple of days, you should be fine.