If you want to use your extra battery, just run your trailer battery, by its self, until it is 1/2 discharged. Then take it out and use your extra.
That is, use them one at a time.
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Mark S.
2014 Cougar 318SAB
2015 Silverado 3500HD 6.6L Diesel 4WD CC SB
18K Pullright Hitch
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