I bought my tires at Costco with a $70 off coupon. I got the most pricey stock size tires and they put on the load E on. At the time, I had no clue about towing and what load tires, etc. I'm glad they put the right tires on for towing.
As I learned more about towing, I was surprised that my Excursion came with 4.30 gears.