4WD.
Reviews:
* Strong V8 power; stout towing capacity; available nine-person seating capacity; extremely quiet highway ride; impressive interior quality. Source: Edmunds
* If you need no-compromises hauling and towing ability, along with a no-compromises, first-rate interior, the 2015 GMC Yukon and Yukon XL are just the ticket. That goes double for the high-end Denali models. Source: KBB.com

