Frame flex
Yep,
I was concerned about frame flex. Before I built the flat bed I tested my truck on steep rocks and ditches measuring the movement. Pretty much figured with the 2016 F350 the cab over should be at min 2” above the cab (3" perfect) so not to touch the roof of the truck, if we were on a bad dirt road with dips and dooos. Didn't have to be 5 inches but that's how it worked out.
I wanted to keep the camper as low as possible to the truck. But when I added the 2 inches insulated floor and accounted for the fuel fill height needed for the fuel to flow into tank well we ended up with the cabover at 5 inches above the roof of the truck. I was anal about the build of the STEEL bed. I couldn’t afford an Aluminum one but as it turned out the way we braced it all my steel bed including the tool boxes added only weighed 100 lbs. more than the original fleet side bed that was on the truck when I bought it. If I had more of a budget and thought about the fuel fill more I could have made a fill site channel at the bottom of the windows up higher. You know how older trucks used to have their gas caps/fills up by the back window of a truck and the gas tank was in the back at shoulder height.
My long time lurking has really helped me design and figure out what I wanted in a camper and what I could afford. I thought I should share a bit of this build because of all the others sharing their great trials and inventions.
I chose the extended bed CO which fits great over the extended truck cab. Make all the room I could to fit on the 7 foot flat bed. Since AK had a 7 foot floor plan in their brochure I went as close to that size, since I was redesigning the floor plan and putting on a side door entry. I wanted to keep the truck as close to the length of the original truck for angle of attack on roads. Making the flat bed 7 feet was the same length as bumper to bumper of the original bed on the Ford.
The camper so far is doing fine with 4 bolts holding it down directly bolted to the flat bed. I have been chatting with folks on wander the west site and here is a link with most of the same pics and story as expedition portal.
A link to some of the pics and conversation on Wander the west.
http://www.wanderthewest.com/forum/topic/15633-flat-bed-side-door-entry-dream-camper/page-4