Trojan T105 Batteries - Need a charger

allen8106, thank you! So, my 5th wheel was pre-wired with #8 (maybe #6, I need to double check) from the roof to the battery compartment. I suppose I could re-rewire. The 2 panels are in series. I am pretty sure between the 2 panels on the roof it has leads coming out from the MC4 connectors to the junction box with 12AWG (renogy specs confirm that). That run is about 2ft or so. From the junction box down to the charge controller, its #8. And charge controller to the batteries #8 too. I can change out the wires from the controller to batteries easily. Is wire size a huge issue? I suspect the length of wire from the roof to the charge controller is around 12ft.

I live in UT, and so I get a good amount of sun, especially during the summer. Every other home around here has solar panels too (small exeragation...)