We are towing a 31 AS with a Yukon XL 1500
2wd with 3.73 rear end. We also use the Hensley hitch. I have found the rig very adequate in the east and south. However, on several occasions last summer to and from Arizona, I would have liked a little more horse power or pulling power in a lower rear end. Several of the passes we made (up to 11,0000 feet) ended in a 25mph crawl in first gear. We made sure we were in first coming down.
Another time I would have liked a 4.10 was going west out of Texas into New Mexico. I40 is a constant upgrade and with a strong head wind, the unit would only go 55 with the rest of the traffic at 75. That was one hard hot day. Most of the time we time we tow with little effort between 60 and 65. In Ga and Fl on I95 we have a hard time keeping it under 70.
With the Hensley, we have no problem controlling the rig. There is absolutely no wag or hint of movement in the tow vehicle. That hitch is worth every dime.