You should be able to put anything on a power on/off (digital) timer, and "exercise" the batteries ... this could be useful if you want to do work inside the camper. If the camper batteries:
- supply the camper fridge, then you can store things from the house in the camper fridge, and get value
- supply the camper heater, and keep things warm over the winter, possible value in florida
- drive the landscape lighting, and get value
I like the idea of moving the batteries into a mobile solar generator for use in your home, such as:
- UPS for critical electronics. simple plug swap, and batteries go back into rv.
- emergency power for critical loads, as in, run the house fridge until grid comes back up
Anything to get value out of batteries, vs sitting idle, and possibly risking degradation, or calendar death without value received. RV's have year-round value in being ready to go camping anytime, but you might be able to wring out more value than that, if you utilize the batteries in some way ...
Hope this helps ...