We did that for two years before buying a honda 2000 generator. Basically when dry camping we used trailer as a fancy tent. Only used pump to pee at night and otherwise used campground facilities. For lights we used round portable LEDs that worked on triple a batteries most of the time. Used paper plates and plastic utensils. Did dishes once a day to conserve using the pump. Refer and hot water on propane but the still use battery power. We ran truck an hour or so each day to top off battery. Worked okay but got old.
Now with generator we can dry camp for a week before tanks fill. That is our limitation.
Also hot a second battery to add more power. Cheaper than a generator and if you don't need the furnace or fan can last a weekend with conservation.