Slowmover: I don't get your calculation of Tongue Weight equaling TV without Weight Distribution minus TV alone. I get 9,180-7,320=1,860; When I weighed just the trailer sitting on the tongue jack I got 1,720; either one is way different than the 960 you calculated...
I did make all these weights at the same time. I went back again at a later date to verify and several of the first few measurements were the same, so I didn't continue to do them all.
I have since determined that my OEM hitch receiver from GMC is rated at only 1,500 lbs, so I am in the process of purchasing and installing a Curt hitch receiver with 2,400 lb rating. We'll see if it makes any difference...
Phil in Irvine
WBCCI # 9759
2002 34 Slide Out Lounge
2005 Yukon XL, 3/4 ton, 4WD, 8.1 engine