@NCMODELA:
Look at the drivers side door post sticker get the payload for your Yukon. That is the weight driver, passengers and gear plus the tongue weight that you Yukon can carry.
Load you family and gear ready to camp and go to the scale. Subtract that weight from the GVWR also on the drivers side door post. That will give you the weight for the trailer tongue weight.
To the UVW of the trailer add 1000# for the load you put in the trailer and multiply by 12% to get an approximate tongue weight.
For example, the one with a dry weight of 5680# add 1000# for your stuff = 5780 times 12% = 693# approx tongue weight.
The closer you get to max payload or max tow the harder your Yukon will have to work.
Hope this helps
Good Luck