Frame Stiffing to reduce Porpoising?
Got a question for you seasoned drivers with older rigs. I have a 1999 F350 Dually Quad Cab Long Bed. I've been driving it for thousands of miles and for the most part, it's been fine. However, while ...
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Is the bed moving around on the mounts to the frame? Maybe, many have rubber mounts (to account for frame flex/twisting, see the side2side above).
I've had 8' and 9' 6" and 10' 6" truck campers on several different GM and Ford one ton drw service trucks. All three TCs were held in the bed with stake pocket tie downs or TC bolted thru TC floor to the bed frame.
At speed the TC tied solid to the bed had lots of lateral and vertical movement. I used truck camper shocks (camper to the cab mounts) to control the harsh vertical movement on rough roads. I've watched the shock extend a good 2" to 2 1/2" going into a strong head wind at highway speeds...so yeah lots of bed movement in this scenario.
Granted all my LDTs in service were not the long WB crew cabs which don't work the best pulling heavy GN flatdecks in and out of close shipping yards/worksites/etc but IMO there probably would be more TC/bed/frame movement with the longer wheel base.
