You are being wise...doing this kind of research BEFORE you buy.
The published weight is the "dry" weight of the trailer. No options, no gear, nothing in the holding tanks. No one camps in an empty trailer.
Find the GVWR (gross vehicle weight rating) of the trailer. Multiply that by 13%. This will give you a rough tongue weight.
I'll add---be careful when the salesman tells you that, "You can pull it no problem."
As I posted earlier, I suspect that you are going to be close or over weight when you load up and hitch up your Yukon with this trailer....trip ready.