Replaced the florescent light with this low profile warm white and red led by Hella Marine. Very nice quality, it's completely sealed with a magnetic slide switch.
Unfortunately it's too low profile, the Trakka tent material when closed covers the light. The material used to tuck up nicely above the old fixture, I'll need to work on a solution.
It was a bolt on weekend. Corbeau LG1 seat. They are sold in pairs, so I got base to make the second one an office chair. I like the original passenger bench seat, but can swap in the other seat for a long roadtrip with a second person. I did not get a seat heater for the office chair.
The head unit came with the car, it's just a Pioneer unit that has apple carplay. I would assume a 24v head unit is a thing. Check Crutchfield.
The camera is a third party for about $50, the same one Crutchfield sells. They do a nice job speccing components that work together. There are several available for about $25 on Amazon that are probably the same.