How Do I Charge, and Maintain 2 New 6 Volt Batteries???

So your saying to hook up both my shore power to use the on-board charger and also hook up my portable automatic Schumacker charger at eh same time for max charging power?

Or should I just run the portable since it has a 10amp fast charge mode and blows out 14+ volts when charging (I need to limit the Honda generator time as much as possible).

Plus I also have the 25' 4gauge jumper wires that can be used as well in a pinch.