I wondered the same thing, then I figured it out, the wheels on the cherokee and wolf are set back a little further then other comparable TTs, I guess its for better handling, because I get very little sway when I'm pulling mine.
Going from a 2007 27' Heartland Trailrunner 2500BHS to the Cherokee 274DBH I not only noticed the wheels were further back than my Trailrunner, but they were a few inches further apart. Also the axles on my TR were larger and the overall payload of what I could carry was more. The TR was 5825 UWV with a CCC of 4975 pounds. The Cherokee is 6230 with a CCC of 1638 pounds. Not that I would carry an extra 4975 pounds but that says something about materials used in putting these things together. Either way my 2000 F250 CC Super Duty V10 4X4 gets the same gas mileage.