Just happened to find this. Looks like Earth Cruiser or ATW, but with slide outs instead of a pop top roof.
http://www.hostcampers.com/product-details-expedition.html
http://www.hostcampers.com/product-details-expedition.html
Host builds vehicles for Earthcruiser, and Host makes pickup truck campers with slide outs. So it makes sense that they would try an expedition-style flatbed model of their own. The photo shows the camper on a Fuso, but it would fit nicely on an F350 flatbed, too.
I think the outback above may be this one: http://forum.expeditionportal.com/threads/156298-OUTBACK-4X4-EXPEDITION-VEHICLE?highlight=fuso
$150k BO
Being nearly 15 feet long, I would not advise that particular camper to be installed on a 1-ton pickup.
Long wheelbase F450/550 sure, but certainly not a 1-ton.
The body (box) is 11.5 feet long. Pretty standard for a slide in truck camper. They work fine on a 1 ton DRW. I'm not sure if they would even sell just the EV box or if they will mount it to anything but the Fuso....They make very nice truck campers though.