Northern Lite 9-6 Q Classic converter/charger help/questions

I have a 2008 Northern Lite 9'6” Queen Classic SE model. It currently has the factory standard single stage Parallax 7345 converter/charger (CC). I am going to update the charging section with a 3 stage Progressive Dynamics 4600 series upgrade kit from Best Converters. Has anyone done this with this camper model? I would like to upgrade the wire gauge size from the CC to the battery since NL factory only installed 10 gauge wire, but I do not see an easy way to do this since the CC is located up front on the drivers side of the camper and the batteries are in the rear on the passengers side of the camper. Most of the wires from the CC are bundled together and run under the floor and cabinets and are not easily, if at all, accessible.

If you did update to a Progressive Dynamics 4600 series, which specific 4600 series did you upgrade to? I am considering going to the PD 4635 since this would be a 35 amp charger and would be safe to use with the factory 10 gauge wiring.

Thanks in advance for any help you can offer.