All good advice. Another thing you can do is what Gene and Fae mentioned, raise or lower the hitch itself. The hitch in the truck bed can usually be adjusted. So can the extended pinbox on the Montana. Just have the rig as level as possible. Just a little nose low or nose high is ok, too, just not too much. This helps shift the weight.
I always heard that a fifthwheel should have 20 to 25 percent in pinweight. Mine's 22%.
Concrete highways tend to cause this bucking, even those that seem smooth in a lightly loaded car or truck. There's something about the relationship between pin and axles of the towed vehicle and the distance between the concrete laplines. Some vehicle combinations are worse than others on a give road. I don't know the specifics but have read about this. We also experience bucking on some concrete roads. Sometimes adjusting our speed can make a big difference.
Several MOC folks have gone to the TrailAir hitch to solve this problem. This is a problem with all fifthwheels, to my understanding.
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