This is something I realized after a couple years towing my Jeep Liberty and wanted to share this with the community.
Years ago I would experience bucking from my Liberty when towing it. I came to the realization as to the cause, read up a little on the subject matter, invested in some additional hardware, and eliminated the problem.
It's all about the "Levelness" of the tow bar. If the tow bar is not level, you will get "tow-vehicle-bucking" while driving your motor home. The greater the angle, the worse the bucking. Using a Quiet Hitch helps but does not resolve the problem. It only partially masks it. Leveling the tow bar eliminates the bucking completely. It also reduces wear of the hitch pin and hole.
My first picture here shows the "Condition To Avoid". I had this for two extended trips of which I tolerated a lot of bucking. The second trip I added a Quiet Hitch which helped some. Note the tow bar is low at the motor home and high at my tow vehicle. This was the day I realized the cause and so I took this picture.
In this picture taken a few years later, I added an offset receiver adaptor to level the tow bar. "Cumulative Play" with the extra connection required Quiet Hitches at both hitch pin areas. The offset receiver also required one foot longer blue safety cables. This setup eliminated 100% of the bucking.
Thinking about this will make sense. Every bump in the road changes the "vertical" relationship between tow vehicle and motor home. An angled tow bar with out-of-sync vertical movement between vehicles changes the distance between them, just enough to cause that horrid bucking. A horizontal tow bar would cause bucking only under very extreme conditions. But then I think you would have something much greater to worry about, like jumping a curb or worse. Getting the bar perfectly level is ideal, but getting it close works too. I cannot say for certain, but I feel it should not differ more than 2 inches on level ground.
If you have an adjustable rear suspension that raises and lowers the back of your motor home, you will need to figure your typical height and not vary by 1 inch in either direction. With that figure, order the appropriate offset adaptor. There are many different offsets available by many sources.