I have 11k miles on my 1500 eco diesel right now, ZERO complaints /issues. Haven't really hauled much with it yet, but mine does have the air ride suspension, and rides smooth as glass. I've averaged 24-25 mpg with about a 70/30% mix of highway/town driving. Looking at the rating, I don't think being over by 400-500lbs. is going to hurt anything. I absolutely love the truck, all the comfort / conveniences of a Chyrsler 300, with the versatility of a pick-up
I know but on the limited the payload is 1000 lbs.........I can put that in my wife's mini van without going over the official capacity.
Its a problem.
Otherwise the ED is a GREAT truck.