Go solar and use the lower capacity battery. It is quiet, and very convenient. We have a 21 ss Roo. We love to boondock away from other campers. I bought a flexible 100 watt panel and glued it to the roof with silicone caulking. I did this on my last camper and ended up selling the panel with the camper, because it was too difficult to remove. I read this blog https://handybobsolar.wordpress.com/...ging-puzzle-2/
and if you slog through it, it tells you everything you need to know. I installed 8 ga. wires from the panel to a fuse box & then to a Morningstar SHS 10 charge controller, then 8 ga. wires to the battery. If you use an oversized controller and you can upgrade the system later if you think you need to. I have the two standard 12v deep cycle batteries that came with the trailer and bought LED replacement bulbs on eBay for less the $40. We can run everything but the AC and Microwave forever without outside power. The entire system cost less than $300. If we wanted to run the microwave, we could probably do short (5 min) runs (using an inverter) with our system, but I donít really need it. We use sleeping bags at night because I hate the noise of the heater going on in the middle of the night. It is still dark when I wake up, and Iíll run the furnace for 30 minutes or so to warm the trailer in the morning. By the time my wife wakes up, the sun is up, and she can run the furnace as long as she wants. The controller shows the battery is charged to 100% before noon (I donít have a good monitor yet, so I really donít know). We have never run it down below 75%, which radically improves battery life. One caveat: We live in New Mexico where the sun always shines. But I find that even with cloud cover for several days, the system works fine for us. Iíve hauled a Honda 2000 along on our first 4 trips, but never used it, and that is just fine with me. In the off season, it takes care of itself, and always keeps the batteries charged. Life is good.