Prior to my current setup, (which is a 35' 5th wheel and F-350), I had a 28' bumper pull with an F-150 - so towing a 28' trailer with that type of vehicle is very easy and not totally my concern. I'm just unsure of your Yukon. Sure, it may technically be a half tonne, but I wouldn't ever compare it in total towing capacity to a similarly equipped Chevy 1500.
I totally missed that your truck is a Denali, I honestly think that puts an entirely new light onto things.
That has the big 20" wheels and tires on it, and there is no way those are LT tires of any capacity - they will be a P rated cushy tire with small sidewalls. Tires have a weight restriction as well and are not factored into the manual or body sticker at all.
You've also just mentioned the AWD - I honestly don't know enough about towing with a modern AWD system, but I would have to think that would put a decent amount of strain on it.
Rear suspension - that will for sure be a comfy set up and might even have air ride on it, I would do some looking into it as well.
Axle ratio - with 3.42s it will be a dog off the line and on the hills. Even that big 6.2L will be working with a tall highway gear ratio like that.
A guy up the street from me hooked up his 29+ foot bumper pull to his Denali last year and it did not look safe at all with the amount of sag it had. (and he had a distribution hitch to boot)
Not trying to rain on your parade, just want to make sure you are happy with what you buy and you and your family are safe.
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