Almost finished with my set up, getting ready for Cruise Moab. Shelves in back a tad higher than the tail-gate, cut to fit the Rigid Tool Boxes. I pulled the 40% rear passenger seat and put my fridge shelf there. I cut up a Queen foam mattress from amazon for ease of removal and increased secured cargo area. Added some aluminum anchor tracks for securing anything that won't fit in the shelving, want to limit this to soft bags, clothing bedding etc. Any camping heavy stuff to be secured in the shelves within boxes.
I can pull this entire set up out in about 15 min. 4 turnbuckles holding the main box in place, 2 seat bolts for the fridge shelf and four bolts holding the sleeping extension to the main box. We'll see how it holds up in moab. lan on using that as a test run, then pulling it apart and making any adjustments needed, then bracing and gluing it all up.
Lots of inspiration from
@CruiserDave 's KISS and
@TheAshenWolf 's build.