I
wish they still made ones like these. There are a few around used. I never really liked the front galley layout but I understood they were making the twin beds for a couple buddies or a father/son (back in the "good old days"
). I actually installed some of these brand new (part of the purchase price back then!) when I worked for a Mitchell dealer. But for some reason I just bought an insulated aluminum frame topper, which I later traded off when I went to logging full time and wanted an open pickup and a travel trailer. I didn't like sleeping with gas cans and saws, plus it was better to have my camper trailer parked and then drive a short distance to work.
The famous author John Steinbeck had a camper something like this on a Chevy/GMC pickup for his "Travels With Charley" (his poodle!). I think his camper was another brand and maybe 10' long because it seems like it stuck out to the end of the lowered tailgate. His camper had a front dinette bed, and galley and closet/icebox on either side towards the rear. Not too unlike a basic sailboat cabin.
Oh yeah ... Steinbeck named his pickup/camper "Rocinante"