Your rail system for the bathroom storage is ingenious and by far the best way I have seen to easily use that space when the bathroom/shower are not being used!
Also owner of Promaster for 2 years now. Deciding to add this harness https://www.ramsareus.com/sku/82214282ae.html. I’m just curious as to what harness do you use as this is a $200 wire so really still thinking if mopar is worth it. Also when you tow what other settings you use when you drive?
That price is ridiculous, go to a U-Haul and ask them.