If you only want something to maintain the batteries when not in use, then I would get a large (~150W+) portable solar kit (Zamp, or GoPower or other panel, controller and wiring all in one), put it flat on the roof (cable lock it) and run the charge cables down to the batteries (you'll need to find a way to jumper the House & Chassis together so all are maintained).
That way you have a simple (no drilling, sealing, mounting, etc.) all in one solution that you can easily move/remove/resell as you desire.
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2018 Palazzo 33.2
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