We are over in SW CT and have been thinking about the same question although with an International TerraStar crew cab, 4x4. We currently have a Northern Lite 10-2 CD SE which we run on an F-350 crew cab, 4x4, diesel, DRW. For longer duration trips we want to carry some folding recumbent trikes and have no place to easily carry them with our current rig, hence the thinking. With that as background here are some thoughts:
1) Cab heights of the MD trucks are too high for the cab over portion of a truck camper to extend over the cab.
2) You can get lots of measurements from the Body Builder Handbook for whatever truck that you are looking at. These can generally be found on line.
3) A number of cab over TCs have been put on larger trucks including Fuso FG 4x4's, Kodiaks, etc. Generally they are mounted with a flat bed or service body so the cab over does not extend over the cab but rather leaves a space above bed and below the cab over portion that is used as a garage. This would work ideally for us. The rig is generally longer than the same TC on a conventional pick up by the length of the cab over portion.
4) Height is a big issue. I recently analyzed this carefully and find that my NL would be about 12ft 7in. high on a 4x4 TerraStar. It would be 12 ft. 2 in. on a flat bed on a F-550 4x4 chassis. These numbers compare to its current height of 11 ft. 9 in. on my F-350 pickup. In these calculations, I am assuming 7" for the flat bed.
6) You can bring the height down by using a pop top camper such as the XP Camper or a Four Wheel Camper.
5) Search the archives of Truck Camper Magazine and you will find some stories about truck campers on some larger trucks.
6) www.expeditionportal.com has some pretty good information on overland rigs that I have found to be a good source in exploring this topic. Rummage around all the forums in the Expedition Camper section. You will find some pictures and threads on this topic.
7) A very interesting solution is the Earth Cruiser which is built in Bend, OR on a Fuso FG 4x4 but is not available in a crew cab as Mitsubishi does not import the 4x4 crew cab to the US. Still worth looking at as it is very truck camper like but different in execution from most truck campers.
I will be very interested in seeing how this thread develops. While you and I are in a minority in thinking about this topic, we are certainly not the only ones!
mcc272
2013 F350, Crew, 4x4, Diesel, DRW
2019 Airstream International Serenity 25 FBT