My solar panels (see post #3 on this thread) keep things charged year round as they are "on" 24/7 (even when towing and in storage). All you have to do is to keep the battery water level up. I don't know what wattage the factory setup puts out (if you find out please let the forum know) but I suspect it would be adequate for storage purposes at least. The main consideration is to let the factory know you at least want the wiring for a solar installation put in when they build the TM (retrofitting the wiring can be done but it's much easier do wire it when it is built). That way you have many options ranging from never installing it or going overboard like I did. Given your situation, I'd go for the full factory package but let them know you might upgrade it later so they put in a heavier gauge of wire.
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