OK you have 860 lbs total available.
Now add,,,,,
Weight dist Hitch*********************100 lbs
2 tanks and propane********************80 lbs
a group 27 battery*********************40 lbs
you now have 640 left, on tow capacity and have added no food, clothing, lawn chairs, nothing, not even enough water to flush the toilet.
Light packers tend to have close to 1000 lbs in a trailer, most end up higher, a few very cautious ones get by with less.
And dont even begin to consider kids and their friends stuff.
Also check your cargo capacity on the Yukon, at an 8000 lb trailer, you will be around 1200 pounds on the hitch, which counts against your payload, also anyone else travelling with you and all of the cargo in the back count toward that number, is it ok there?
Happy motorin