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I think running without the alternator for shorter trips is a very good idea. Using a portable PV array to help keep it topped off is also a good idea, but, I wonder if it's worth the cost and trouble? I think it may be if you remain parked for long enough stretches to provide a substantial charging. How long that period of time is, I have no idea. Depends on the size of the array and the strength of the sunlight.
I think a better idea is active management of when the alternator is used and use of deep cycle batteries. A simple way would be to toggle it on with the brake light signal. An accurate voltmeter would tell you when your charge was getting low enough to need to go to full time alternator use.
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