I believe the manual reccomended 1500 miles before the first tow. (Which is what I followed) Even then, it's not like I'm towing a house! It's just a 20ft enclosed race trailer with a MINI inside. (Maybe 8000lbs)
Can't wait to get the truck back. Miss it and I'm looking forward to our trip up north in August. Truck rides and handles great and hate for this minor problem to be screwing up the experience.