Might be worth it if you ever had a dog that liked to roll in dead stuff. I'm thinking Iron"people" athletes for this thing. I've used a one gallon Ziplock and a Handiwipe. An inside out dry sack makes a usable washing machine. Still have my original Kanga Roo roof pouch from when I had an SUV and wandered the West in the 90's. Used mostly for putting the stuff from the inside on the outside overnight when sleeping inside. Security and wind drag always being a concern.
I found that a folding table along with some plywood also works in that gap. Folding table is handy to have while camping. There's another thread about Prime Camping here - Car Camping in a Prius Prime | PriusChat - also.
I have an idea how to heat whenn pluged in. Set up climate control for every 30 mins. It stays on 10 min before, and 10 after set up. So you have 20 min off on 60 mins hour. What do you think SM-G950F ?
Looks good, but you really need a thick closed cell foam "mattress" I would say at least two inches, if not more. I can't believe that flimsy packing quilt will give you much comfort. Checkout some camping or sports stores.