The wetness on the top of the black tank is my own fault, I was working on the black tank flush line and it emptied over there while I had it disconnected.
Yes, the BR is on the driver side which is why I think the black tank needs to come out that side due to the connections, and the gray tank on the other side due to the connections. Regarding the plastic floor, I had thought about cutting out that part of the floor under the tanks and reinstalling it later with some steel reinforcement straps bolted underneath...but wasnt sure if there was an easier way. I do plan on adding heating pads under the tanks when I put everything back together.
I had to put in a new hose reel a while back, and that was a real pain...but when I did it I rerouted the water supply to go into my basement where I installed a 3-filter system and water softener (see pic). Love the fresh, ultraclean, soft water!! All water that goes into the fresh tank is already soft and pre-filtered that way. (Everything is secured now, just hadn't done so when the pic was done. I also have quick-connects to the two spigots on the roof of basement where I attach a filter canister with salt so I can backflush and recharge just by turning a few valves.)