Originally Posted by Teamfour
If you are using a WDH, don't forget to add about 75-100 lbs for the weight of the hitch itself. Also, where did you get the cargo capacity figure of 1260 lbs? If it is from the brochure, ignore it. You will need to see what the payload capacity sticker on the actual vehicle is. It will most likely be lower than 1260, possible significantly lower.
I learned something valuable today. After lots of research into whether or not a Hensley (or similar) hitch ADDS to tongue weight or not (Hensley says it doesn't, many others say it does), I decided to buy a Shirline scale and actually measure it. I have a Cherokee 23BD with a stated dry tongue weight of 488lbs. My TV has a max tongue weight rating of 550lbs, and the Hensley Cub weighs about 185lbs so I knew I had to find out for sure. First I put the scale under the trailers foot, and measured 760lbs! But that includes propane, battery, and a loaded TT. And also the foot is about a foot behind the ball coupler. So next I put the scale under the Hensley "stinger" at the point where it connects to the TV receiver, to measure the actual weight exerted on the receiver itself. To my surprise, it was 480lbs with the trailer lifted off the foot completely! So it actually LOWERED the effective tongue weight from dry, despite the TT being loaded! I repeated these measurements a few times because I didn't believe it, but same result each time. Once I thought about it, it made total sense. The Hensley itself adds about 12" in distance between the receiver and the ball coupler, in fact with the stinger included it's probably more like 24". This extra leverage creates a mechanical advantage, reducing the amount of force it takes to "lift" the TT. Like putting longer handles on a wheelbarrow, even if those handles are heavy themselves. So by measuring I proved to myself that the Hensley (and similar designs) does in fact negate its own weight, and then some. Hope this is useful to anyone that's wondered the same thing, and if I'm missing something important please let me know! Thanks!