I’m a little late to the party, but I’ve just completed a transfer of my Northstar Laredo from my 2001 Dodge Cummins HO short bed to our 2020 Ford F-350 gasser short bed super cab.
Ford’s cab is taller than either RAM or GM’s cab.
Fords need a riser, the height of which is determined by the year, and if it has truck cab top running lights or in my 2020’s case, dual xm radio antennas on the back of the cab.
If the Ford truck is pre-2017 it has a steel bed and no dual antennas.
For that you can use a 2 inch thick, 4 feet by 8 feet block of blue foam with a 25 pounds per square inch non-compressibility trimmed to fit your bed. This should give you enough wiggle room for any exigency on rough roads.
My solution for our 2020 with a aluminum body and the dual antennas which stick up more than two inches more was a 4 inch thick, 4 feet by 8 feet block of blue foam with a 25 pounds per square inch non-compressibility cut down to 6 3/4 feet to fit Ford’s short bed. I used the cut off piece glued to the front of the bed at the bulkhead to space the camper rearward enough to not destroy your taillights. This gives me a bit more than 2 inches of clearance over the cab.
If you don’t have a 2017+ Ford you can get by with a 2 inch block. With a short bed you will still need at least a 3 inch spacer at the bulkhead to save your taillights.
So are there any other benefits? Yes, with the 4 inch block you get R-19 insulation in the floor of the camper.
2020 Ford F-350 XLT FX4 4WD SRW SB SC 7.3L Godzilla Gas TorqShift 10R140 397 amps dual Alt dual batts Frnt Dana 60; Rr Dana M275 E-locker 4.30's 4580/4320/4066# payload 7243# curb wt. 11,300# GVWR 5-er prepped. 2020 Northstar Laredo SC, 12v compressor fridge, cassette, 320w Solar sub zero insulation.