E&J push'n wind wrote:
With the "premium" hitches (and this is where the firestorm begins) the pivot point is "changed." I'm not an engineer so I can't and wont attempt to explain the math. The only one I can explain is the Pull Right where the pivot point is literally and physically moved forward to the center line of the rear axle (or as near as possible).
Good explanation E&J. I'm not an engineer either but there are 50+ pages of diagrams and engineering explanation in
this sticky thread about how the HA and PP work. Technically the 4-bar linkage uses geometry to create a "virtual pivot point" ahead of the rear axle of the truck, so that the performance of the trailer mimics that of a 5er where the kingpin hitches in the bed just ahead of the rear axle. Simply, I show folks that movement of the cams only allows the TT to move side-to-side if it also moves forward. Think of a "U", with the trailer coupler at the bottom of the "U" and the open ends attached to the truck. The "U" is the only path that the trailer coupler can follow. Moving to the side it must come closer to the truck and when the hitch is in tension when towing down the road, it's not possible for the TT to go faster than the truck. The caveat is that you're brake controller must be set up properly to deal with situations where the TT could be moving faster than the truck, such as when the truck begins braking, etc.
I don't agree that the only beneficiaries of premium hitches are those who are overloaded...I am well under every rating and still enjoy the stability of towing with a Hensley.
