Hello Brad!
Great to hear from you! I am glad you are getting good use out of your solar package.
My PD transfer switch failed too and they sent me a replacement which has been working fine so far. I did wire my small Honda generator to the transfer switch so it works as intended.
Regarding water replenishment, consider one of these water bladders. It fits nicely in the back of the truck behind the hitch and holds up to 60 gallons of water. Perfect to refill the fresh water tank without moving the rig. I connect it to the “winterize” inlet so I can used the water pump to transfer. Connect the outdoor shower outlet to the city water inlet, switch to fill and it works
https://www.bayteccontainers.com/60galwaterbag.html
Amazon does not seem to have the 60 gallon one just now. When empty, it is really lightweight and folds up to about the size of a paperback book
My next upgrade to the SSF system will be a couple of more batteries, just trying to decide where to put them.
Best Regards, Mike