To conclude my post about pushing my 19ft Airstream back enough to drop my tailgate. I thought I had it solved with a 13 ¼ inch (pin hole to middle of ball) hitch. After turning my jack sideways I was very frustrated to see that I was A FEW FRACTIONS OF AN INCH SHORT of being able to drop the tailgate!
By the way, at first the ride seemed to have just a little more pull and bounce but when I saw that I was just at or below level, I turned the ball mount over and raised it ¾ of an inch and I was back to the smooth, no sway or bounce ride I had with the shorter ball mount.
Now, I find that the next size up in a ball mount which I can find (with out a huge rise or drop) is 16 inches. The 13 ¼ inch length worked well. Ideally I would like a 14 inch length but 16 worries me.
The only solution I see is this 14" "raw" ball mount bar from e-trailer, to which I would have to weld a ball mount platform. I wonder about its capacity but, in that it is solid steel I would think that it would handle my 4,800 lb max Airstream with a 550 lb hitch weight.
Any thoughts? Here is the raw bar. http://www.etrailer.com/Hitch-Accessories/Curt/D31.html