Don, the coach builders always cheap out on the size of the factory wiring down from the roof, so voltage drop is a concern. I'm not interested in pulling new wiring through the coach... so probably either series or series-parallel. So likely operating at 36 or 72 volts from the panels.
The controller does have remote temp sensing.
Controller pageMy thinking on sourcing through HD is twofold.
Free shipping to the nearest store.
Easy returns if there's a problem. I'll open the box in the store and see if the panels are OK. I shudder to think about shipping panels.