Thanks John, I will. It's a pretty short run for the wires from batteries to inverter, as far as I know. The batteries are under the inside door steps, and the inverter is mounted in a storage compartment outside and right next to the side door. Might be 6'? Not planning to go much over 2000W for the inverter. Just want a little extra wiggle room. For allowing multiple draws without thermal or other auto-shutdowns.
As far as batteries upgrade, prefer AGMs, but would consider anything that would hold more Ah than the originals. Space is the limitation, unless I make use of the storage compartment with the inverter to add some extra amp hours to the battery bank.
The solar setup has a 510W/30A input max for the whole system, and the roof connectors are limited to 150W panels each. The installed ZAMP flex panels are rated at 100W/5-6A - I'd like a little more help there as well. Not sure about the ground level portable input connection. Hope it's in the manual somewhere. It can't be more than 60W max. I'm not looking to run the roof air off solar obviously, but I'd like to be able to maintain a decent sized battery bank for longer off-grid boondocking, without running the engine alternator (220A), or the propane generator.