An answer to a question please?

They will likely be able to dry camp without issue as long as running their generator from time to time is OK. Depending upon how they use the coach and what goodies they want to use the generator will likely need to be run a bit at night so they can watch TV and cook and this will keep the batteries charged before going to bed. There should be plenty of battery power to keep the fridge running over night and since you are going to need power for the coffee maker and breakfast, running the generator for a few hours in the morning will get the batteries charged back up again. Solar can help with the morning but won't help at all for the evening hours so a generator is still going to be necessary to some degree.