You don't say the year of your truck, I am guessing that it is the "newer" superduty style body. The 3 things that I know to check is the tail gate openning, make sure the camper will fit through the tail gate openning and the bed to cab hieght. Check to see that cabover part with not be sitting on the top of your cab. And the bed rail height so the camper "wings" don't sit on the bed rails. The supper duties have a smaller tail gate openning and deeper/taller bed to cab height. For two of the 3 you can build a bed spacer to raise the camper the usual couple of inches it takes to clear the cab/rails but if it won't go through the tail gate you have a problem.
Also be careful of weight. It is the biggest problem with using a 3/4 ton truck a lot of campers will max out a 3/4 with nothing loaded in them (dry). If it fits you may want to weigh it before you buy it to see just what it weighs, then add a 1000 pounds and see if you want to carry that on your 3/4. You need real good (load rating) tires on a single wheel truck when carring a camper.
Are you thinking about towing any thing? More issue with tongue weight. It adds to what your rear tires have to carry. Longer camper requires a hitch extension and normally a bigger hitch as well. All this really start to add up for 3/4 ton truck to do, it even pushes the limits of a 1 ton with a large camper.
'03 F350 DRW 6.0 auto
2003 A990S Arctic Fox