I am not sure how far you drive from boat storage to the lake but I know at least one guy who use to run a Stealth1 on-board DC charger. That system has a towing option for charging the boat batteries while towing the boat on the trailer using the car's charging system. I don't know what the setup would cost but you could call Stealth1 and ask. He is located in Hixson TN.
I understand that you can do the charge while towing using a Trollbridge system too but I don't know anyone who uses that system. Might be just as good but I don't know.
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