Used Rhino Rack Pioneer platform for sale, $600. Includes 4 locking quick attach feet. 72”x56”. Fits great on a full size truck shell.
https://bozeman.craigslist.org/pts/d/bozeman-rhino-rack-pioneer-platform/7342927257.html
ARE shell - magnetic grey metallic, fits 2016/2nd gen Dbl cab Tundra. $1800
Passenger side win-door, sliding front glass, Thule roof tracks
https://bozeman.craigslist.org/pts/d/bozeman-2016-are-camper-shell-magnetic/7342915190.html