Look at the tire / loading sticker (on drivers door) for your Yukon. It will show a max occupant / cargo weight. That is the tow vehicle's capacity to carry combined weight of people, pets, cargo, weight distributing hitch (about 100 lbs), and trailer tongue weight.
On the trailer, look for a decal or sticker showing unloaded weight and cargo capacity of the trailer. The unloaded weight and cargo capacity, added together should equal it's GVWR.
As a norm, you won't load the trailer to it's GVWR, however, the average load of propane, batteries, dishes, pots and pans, bedding, camp chairs, BBQ, groceries, toys for the kiddies, and water will weight about 1000 lbs.
Add that 1000 lbs to the unloaded weight and you'll have a ball park figure for loaded trailer weight. Take loaded trailer weight and multiply by .13. That will be a ball park number for your loaded tongue weight. Keep in mind, tongue weight is not a constant number. It goes up and down during every trip.
Example: Say the loaded weight will be 7000 lbs. (7000*.13= 910 lbs)
The max occupant / cargo weight on the tow vehicle would need to be high enough to carry 910 lbs tongue weight, plus 100 lb hitch, plus the weight of the family, and any cargo carried in or on the tow vehicle.
If you need to shop for different trailers, you can take that same max occupant / cargo number and subtract family weight, subtract WD witch weight, and subtract cargo weight to find the payload available for trailer tongue weight. Divide the available payload by .13, to get loaded trailer weight that would put you close to max weight.
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