So this came off a Tacoma. We managed to force it into the bed by wedging all but the back in, then we both got inside and slid it down. When I got home and measured it had spread the bed of the truck out an inch. The tailgate opening has some "hips" in the bodywork that are about 50" if I remember right. These happen to line up EXACTLY in front of the wide rear box on the door side.
After taking it back off, removed the front wall bumpers and replaced with very thin ones made from spare linoleum built up to shore it up to the cab. Then measured carefully and routed out grooves in the aforementioned location of the hips, just in front of the rear width box. It snugs up perfectly to these, the front of the bed, and to the edge of the tailgate. Got lucky. Had to remove a little bit of the hardware around the tailgate too to minimize the routing.
So, this might be the only one of its kind out there and there are reasons for that! Haha. With the exception that ATC has made a shorter shell for one already. That's probably the best idea but I figured I'd chance this one. The Axle COG isn't great but it's been fine with a Hellwig and Air Lift. I'd love to raise the rear a little more though. It's not nearly as saggy as the first picture suggests, maybe 1" different on flat ground.
I didn't like the built in fridge since I'll be boondocking and running starlink, I have 550 Ah of lithium in it, new DCDC, etc. so I replaced it with a CFX3 that sips power.