I've meant to add a few pics for quite some time now. On a phone call so I have a multi-task moment.
Just your basic Rhino-lined and floor matted old man truck bed interior. I'd like to just use the floor mat as a "clean" surface and lay my sleeping pad right on that (talk to me about thermal conductivity there Davy) and roll the mat back if I need to use the truck bed. I like the shelf concept I listed above and would make a shelf with some storage bins to contain stuff and keep dust out of sleeping gear.
My plan is to crawl up in the bed (fiberglass "tent" already put up), remove my sleeping pad from a container and roll it out on the rubber mat, then throw down a pillow and bag and be "camping". Kind of a permanent type RTT but more aerodynamic and without the foldout and fabric drawbacks of a tent. One or two containers for sleeping gear and another for primitive cooking gear and a lantern. The only real drawbacks I can see are the limited vertical space (depending on tent you can have the same type of issue) and a little more time involved if I need to pull the shell off (I'm older or this shell is heavier than others I've had---I've always taken the shell off myself but I need a steering hand from a helper now).
I really haven't spent much time with this project lately as I'm working on modularizing an ARB compressor I traded for to plug-in to the Dodge and be able to swap to the Jeep, working on the kitchen my wife is starting to love (pulling electrical through a finished basement ceiling over my pool table is a little challenging) and doing the RR4W Labor Day Campout thing has taken up a bunch of time and funds.