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Hi my name is Robert..
So if I understand correctly you want to use the charge wire that is present on the tow plug and wire in the solar panel to that point?
That should be fine but is your solar panel going to have some type of charge controller? IF so then no worries, if it does not have a charge controller then you may have to monitor the batteries and see what they are getting charged at the voltage should not go over 15 volts. The tow wiring should be able to handle about 20 to 30 amps..... Robert