I agree with Ironhorse but you'll want to be careful. A trailer of that length will create a lot of sway with a Yukon, and once you load up a trailer and a tow vehicle, your weight adds up fast. Also, a 3.42 rear axle will cause you anger going uphill and might get you the stink eye from the Feds in BC.
I used to tow a 27 foot trailer with a half ton pickup, but it had a 4.10 rear axle, which makes a big difference. When I went to a heavier trailer, but the same length, the half ton wasn't enough and the tail was wagging the dog a lot more, and found a 3/4 ton was the solution.
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