[PGSigns]

I dont think rolling the lips is going to get you what you need. From the pictures you need about 3" on each side to allow that tire to tuck under the fender. The truck will squat and roll some when it leaves and you need room for that along with room for the tire to move side to side on the rim some with out hitting. Two things that you can do are change the wheels or narrow the rear. If it were me I would narrow the rear and put the c-clip eliminators on it when I did it. If you are thinking of going to disc in the rear it opens the door for a 9" bearing end and the axles made for it. Much better than a c-clip eliminator.
Jimmy