I currently drive the Z71 and looking at buying a Yukon. My truck can barely handle my dad's RV and I am wondering if dropping down to the shorter wheel base Denali is going to hurt my towing capability in a material way even with the bigger engine? I believe the loaded weight of my dad's RV is right at about 8,000 lbs. This link says the Yukon can barely handle it. I can't find a similar link for my current truck to be able to compare.
http://www.gmc.com/yukon-denali-luxury-suv/features-specs/capabilities.html
http://www.gmc.com/yukon-denali-luxury-suv/features-specs/capabilities.html