When we are traveling down the highway, should we have our coach batteries on or off? We are in a 2007 370XL. So having said that, when we are camping with 50 amp service, should the coach battery be on or off?
If you want them to charge leave them on. They charge off the alternator as you travel. If you're running the refrigerator the controls run off 12 volts so the batteries will have a draw off them.
Reminder you'll need to check the batteries periodically so they don't boil off.