First thing I did was have PC move the antenna to make the front open.
Second the best thing I installed was the Bogart TM-2025RV TriMetric Meter, this tells you what % the batteries are charged to. It's impossible to know by monitoring the voltage.
I had PC install the charge controller, the Trimetric and the shunt and the wiring up to the arrays. I installed the arrays myself.
This is what I bought.
Morningstar ProStar PS-30 30A, Charge Controller without Display (12/24V)] EA 1
Kyocera KD140SX-UPU 140W 12V Solar Panel with J-Box] EA 2
Bogart Engineering TM-2025RV TriMetric Meter with Enclosure for RVs] EA 1
Bogart Engineering 500A, 50Mv Shunt ] EA 1
Here is where I had them install the controls. Near door & batteries.
Here is the Trimetric, I had them move the inverter controls and the RV monitor all in same place near switch for awning.
2 pair of #10 stranded wires from the charge controller to the 2-solar arrays on the roof.
1 pair of #8 wires to the batteries from the charge controller.
This was 4 years ago, I'm sure newer arrays are available now.