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Stop using the batteries to heat the coolant and oil. That will save you many Ah right there.
Use solar to keep up with the rest of the demand. It will at least reduce the depth of discharge until you are able to charge again.
Another idea is to use smaller removable batteries and engineer them for easy access. That way you can take them out and charge them indoors and pop them back in.
My last thought is an alternator switch that can be turned on when decelerating.
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