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Maybe pogo is the wrong word, rear porpoising is more like it which can be a coil spring by byproduct, only when towing and only over stutter bumps or expansion joints. like my sig says it’s Thuren coils and Fox 2.0 shocks. doesn’t happen a lot, just enough to bug me
I have the same issue occasionally, if found that if I add more weight to the back of the truck(from the trailer or just stuff in the bed) it helps significantly. On the list of upgrades is also some new shocks and I hope that will help as well.
2450 at 65mph seems high, trailer must be a hard pull for one reason or another . I pulled a Keystone Raptor 423 from MN to WY into the wind and ran ~2000rpm and overall got 10.2 mpg with my 2500 diesel (2021). MPG was 7.0 until turning south. NW wind makes a huge difference. Great MPG from Rapid City going south made up the difference.
That area is part of the Appalachian foothills. We upgraded to a 2911bs and it's essentially the same story. To its credit, the 6.4 will hold 65mph all day, it just works hard to do that and as a result drinks alot.
I had something similar. I drove from Houston to Colorado springs and back for a job, towing a trailer (microlite 21DS) the entire way. From Houston to Colorado springs, I had an indicated 9.7 mpg, generally 10 until i-25. On the return I faced a good 25mph+ wind from a front I was chasing (left Colorado hours before a snow storm). My trip average dropped to 8.6mpg after the ride home. I generally ran at the speed limit which was 30-75 depending on the area.
