Yukon TV & rp-196

Originally posted by ash The moral of the story: This trailer is super light, but it is also pretty tall. Tall and light are the perfect combination for disaster when it comes down to speed and wind. I would recommend you buy a good WDH system with sway control. It will save you from headaches and troubles down the road.

Originally posted by offgrid   "a wdh is not required to address that issue, clearly the very light tongue weight is not a problem for the Yukon. Sway control is what is required. Two different things. If you want to combine them OK, but let's not confuse the two."

A wdh won't really slow down the up and down movements significantly. If the wdh had dampers it would but it doesn't, just steel bars that act as springs. In fact if you ride over say concrete highway or bridge expansion joints at a speed that matches the resonance frequency of your wdh springs combined with the mass of your trailer/tow vehicle the wdh will make the rig much more susceptible to bouncing. I've had that happen several times, on one bridge in particular with bad concrete expansion joints, the oscilations got pretty bad but stopped when I slowed down about 10 mph because the inputs not longer matched up with the rig resonance frequency. There were no oscillations on the same bridge without the wdh. 

All wdh's are springs. So they increase stiffness against up and down motion at that joint. That will change the resonance frequency which is the natural frequency of up and down oscillation in the rig at that joint. Resonance frequency is proportional to the square root of k divided by m where k is the spring constant and m is the mass. So a stiffer spring which has a higher spring constant k will result in a higher resonance frequency.