Timbrens or Firestone ride rite bags and camper cover?

I would not recommend Timbrens. Had a set on my 2008 F350 and they did not work worst ride ever. So I guess the firestones are the way to go given your choices. However, I would look into updating or replacing the springs. When I took the truck to a spring shop they suggested adding two leafs on each side, after putting the springs in the truck rides great to me this was the best upgrade that I have made to the TC.