I'm curious, where did you come up with 8500#? You have an XL, assuming you have a 2WD, your max is 8300#. If you have 4WD you're down to 8000#. This also assumes 3:42 gears. Drop 2000# off those numbers if they are the 3:08s, including the GCWR. See page 9-80 of your manual. Check your RPO list in your glove box, look for either GU4 or GU6. You need to know this before proceeding any further. 2000# is quite a difference. Also in the manual is the max tongue weight, 1000# with WD hitch. Otherwise I think you're looking at everything right.
GU4 = 3:08
GU6 = 3:42
Link to 2015 Yukon manual Nybillygoat wrote:
With the short Wheel base and low payload rating you will be white knuckling the whole time.
He has an XL, long W/B, GMCs version of the Suburban.