What are the numbers on the door stickers for front and rear axle weights, gross vehicle weight, combined weight if it is given, payload for your specific vehicle (you may want to go fill the fuel tank, load up the family and head to the CAT scales and get a truck weight.)
A Limited is a model loaded with options, those options have weight that takes away from the payload of the truck. 3.55 gears to me, don't seem like a good choice for towing, but whatda I know? I'm using a stripped out RAM 2500 (CTD, 6 spd manual, 3.73) to tow a 7500 lb 23 ft trailer.
This ain't gonna turn out good at all.
Charles