What year is it. Didn't they make a 2500 version of the Yukons? what's the difference between the 1500/2500, that maybe you can swap over the pArts instead of buying a whole other vehicle just for towing.
If it's a engine swap then disregard lol.
Or maybe do some upgrades to your current ride to make it tow better,. More power, better brakes, suspension.