Join Date: Aug 2004
Feedback Score: 0 reviews
It's the trailer causing it, not the truck. The 19 uses the same aluminum body as the F-150 and it is super sensitive to oddities such as an imperfectly balanced trailer, or an improperly torqued trailer wheel and they can be felt in the cab. I had pulled a flatbed with mine, and got to 60 and the truck shook like crazy. Turned out a wheel was not properly tightened on the trailer, smooth as silk afterwards. Had it been my 14, would not have felt it.
In your case, you are getting trailer sway, move everything forward to get more weight on the tongue, and/or drop the ball down a bit to lower the tongue and your problem should go away. A little trailer sway with a SD should not be felt, but with the new aluminum body, it just might be felt more than normal.
DD 2018 F150 Platinum 3.5 EB
Sold due to neglect
U.S.N. Paradise BB91904
'99 F350 CC LWB DRW
Mods, SuperHyper Improbability drive stage II.
Hypermax 5" turbo back system, triple pillar guages, Heater core shutoff. AEM Brute Force intake. 3.73 gearing. DP PCM with 80HP Installed!