Hensley and Propride both project a pivot point closer to the rear axle and you get a behavior much closer to a 5th wheel is much more forgiving. A lot of people go to the HA pr PP hitch to get away from a sway problem which could be corrected with a better balanced and properly set up rig. Often it is an undersized tow vehicle. Often it is as simple as correct tires or tire pressure on the tow vehicle, or not having the weight distributed properly in the trailer.
In a lot of cases, the HA or PP hitch covers the problem up at the expense of the wallet.
I have towed a travel trailer many a mile with an tried and true Reese Dual Cam straight Line hitch...but it was set up properly and with an adequate tow vehicle.
Whe we were starting out with an RV and what was a less then ideal tow vehicle, I fought getting it dialed in and finally got it much better, but we did get a little sway tendency from time to time. We found the water tank was behind the axles, so we did not carry more than 1/4 tank of fresh water
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot