update:
Here I sit in my beautiful new PC, in the Elkhart campground for the last night before taking off for the long drive home to Florida. Photos below (if I post them correctly). So far, I am absolutely thrilled with this PC, and the amazing customer service from everyone at Phoenix. They spent lots of time going through everything with me and making small tweaks, adding some extra shelves, mounting my genturi connector, etc. From wishes to paper to dream-come-true, the Phoenix team made it happen for me.
Thanks again to forum contributors who gave me lots of ideas and information (yes, I looked for, found, and had the sharp pointy screws against the macerator hose replaced with round-head bolts). Without you all, the intermittent fan noise under my refrigerator (Inverter) would be a mystery. Now fingers crossed that our trek home will be uneventful.