If it's an F350, the GVW should be 11,000, but may be 12,000. The earlier "new" style F350's are 12,500, and I believe my friends '08 is 13,500. That truck should weigh between 9,000, and 9,500. Why is it registered so high? Do they make you register the truck for the Gross Combined Weight of the truck and any towed equipment? Here, you would be wasting money, as it wouldn't allow you to haul anymore, and you have to pay per 1k of weight for the trailer registration as well.