Originally Posted by walljammer
A lot has to do with wheel base
and distance to axles on trailer!
Virtually all the "bucking" comes from that.
Wheelbase, distance from TT axle to each TV axle.
Each has a "resonance" which, combined with spring rates and vehicle(s) speed, have a range of speeds at which it will shake you like a Bond martini.
2012 Ecoboost Screw, 3.31 (yes....really) rear end.
2016 Flagstaff 26FKWS, about 7500 loaded
Retired AF Mustang.....Picker always looking to jam.