kfp673,
A note of caution regarding your built in charger.
If it is located any distance at all from the batteries, you may have a substantial voltage drop between it and the battery bank due to undersized wiring in the RV. You can determine this drop by measuring the voltage at the charger and then measuring the voltage at the battery bank. The difference is the voltage drop. If more than a couple tenths of a volt, it is probably too much and your batteries won't get a full charge. Either change the location of the charger and use large wires, or use an external charger.