Electric refrigerator in toy hauler...Dry camping experience

I have two group 29's in my little truck camper, which comes in handy when you are boon docking and the temperature drops. I assumed they only put the residential fridge in units designed for full timing in resorts or for people that park hop. You can run jumper cables between your tow vehicle and RV if you have depleted the batteries too much to start the internal generator, but you are shortening your battery longevity by running them down so low and often.