It's the tires. It is enough that it even changes the 4th character in the VIN.My Lariat has a max payload of just less than 1,600lbs. I was under the impression it would be 1,800lbs. I have the extended range battery, max tow package, and all terrain tires.
Did some searching and the all terrain tires apparently reduce the payload capacity by ~150lbs, but the math still doesn’t add up. I’m sure this is an easy answer. Thanks for any help.