Gulfstream Conquest 301TBLooking at the tt specs, it is likely too much trailer. It may fall under your "tow rating" which doesn't mean much. You will likely exceed several other ratings first.
Your biggest issue will be payload of the Yukon. Look on the door jamb sticker to find what yours is. (weight of passengers....should not exceed...) That number must include the weight of all passengers and gear loaded in the Yukon, as well as the hitch and tongue weight of the trailer.
The numbers listed on the brochure are "dry" weights which are pretty useless to go by. Nobody travels with an empty trailer and it doesn't include factory added options. You should look at the delivered weight sticker for the specific tt you want, usually on the screen door o inside a cabinet.
The "dry" tongue weight is listed at 900lbs. It will be over 1k once the battery and propane tanks are added, and even more when you load you stuff into it.
I'd guess that the Yukons' payload is less than 1600lbs. For simplicity sake lets call the tongue weight 1k lbs, plus another 100lbs for the hitch. That leaves you 500lbs (likely less) for all the passengers and cargo in the Yukon.
Don't know what year your Yukon is but the '16 has a tow rating of 8300lbs. The "dry" weight of that trailer is 7100lbs. With options added it is probably closer to 7400lbs delivered. By the time you add you "stuff" it will exceed 8300lbs even with the tanks empty. Keep in mind as well that the tow rating is reduced pound for pound by the weight of passengers and cargo in the Yukon.
To sum it up, forget the tow rating. You need to know your vehicles' payload rating, axle ratings, tire ratings, hitch reciever rating, and weight of all passengers and cargo. Then find actual weights for the trailer. Estimate cargo weight added to trailer (~1k for a family of 4) and tongue weight (approx. 13% of loaded tt weight)
I think you'll find it greatly mismatched unless it's just you and a Chihuahua in the Yukon. If you can make the weights work, I think you will still find the 5.3l lacking in power for that tt.
'17 Ram 2500 Crewcab Laramie CTD
'13 Keystone Bullet Premier 310BHPR
Hitched by Hensley