All Super Duty's since I don't know when have had Class V 2.5" receivers. My '06 does as well.
How much tongue weight do you have now? All loaded out my rig is about 8000lbs including about 900lbs+ of tongue weight and I do use the WD bars but have them set on the lowest setting that is recommended. The Super Duty's hate to much weight being transferred to the front end as they just don't need it and it will affect the handling of the truck.
The rear axle of these trucks will take a LOT of weight, give it to them.