2014 Tahoe 5.3 for our 16XRB. Perhaps overkill, but our 2007 Trailblazer I6 couldn't get us above 10,000 feet in the Rockies. No problems now and lots of room and comfort. World of difference and no worries. However, my dream car is a replacement for my old '96 4Runner and I'd take a Sequoia over this Tahoe. Unfortunately when I needed a new tow vehicle I couldn't find a Toyota, had to settle for GM.