I have the Hensley Arrow hitch and use it to tow my 27' Safari Airstream TT. Its a fairly massive assembly requiring some of the hardware to be attached to the A-Frame assembly on the tow end of the trailer ( a couple of hours work to install and align), and a special Hensley supplied drop hitch that goes to the 2" receiver on your truck. After 3 years of using, my pros and cons:
1. The drop hitch is fairly heavy, and has to be put on and taken off whenever you don't want the tail protruding from the rear of the truck. Guessing 20 - 25 #.
2. You need another rig for each trailer you tow using this system as it would be very awkard to move from one TT to another. Its so expensive, you never want to buy more than one.
3. It's well built. No quality problems. Built to last a life time, and warrantied to last that long from normal wear and tear.
4. It performs as advertised. Controls TT sway very well. On windy days, or passing Semis, you never know the TT is wagging back there. The TT will still move in a cross wind, but you don't feel it in the truck because of a unique mechanism in the hitch that allows the trailer to move, up to a couple of inches to either side of longitudinal center line, without puting a side force on the towing vehicle. The TT reaches a side force equilibrium with cross winds pushing on one side and off-center drag causing (due to down the road velocity) wind on the other side, until a force balance is reached. Kind of a neat design.
5. Weight equalizer is built into the design and is adjustable for any practical weight distribution. Takes maybe 5 minutes to set the equalizer force during hitch-up. Once you have the set-up the way you want, its easy to return to this setting each time you hook-up.
6. Speaking of hook-up, it takes some getting use to. Instead of just getting the close to lined-up up ball under the cup on a normal TT, and then lowering onto the ball. With the Hensley, a tapered receiver bar has to be backed into its mate on the trailer. This has to be fairly well aligned not only in height, but also in back-in (side to side) angle to engage properly. I've got the process now, but it took some practice.
7. The overall hitch length is somewhat longer that most. This required me to get a short extension cord for the trailer wiring harness to reach from the vehicle socket to the plug on the trailer. This all depends on the stock lenght of the wire on your TT.
8. Am I happy? Yes! It pull the trailer like a dream, and for me that overrides any negatives.