Ya Id say if you want a bigger tow rating you add air bags to help out. Id say the only real difference between a dually and a SRA is there are more leafs in the rear. Air bags will help stifin the ride. The other downfall is. I think EXT cab ac CC cab trucks are rated to tow a little more because they weigh more.
All in all I dont think it will be worth it to try and make a dually
