A: Yes, they fit all 2008 to current 4500/5500 trucks. Caster shouldn't be a problem, that is the rotation of the axle fore and aft. Some of these trucks have camber issues and that would be corrected by the ball joints or perhaps a bent front axle. If you get the adjustable arms, you can adjust the caster and axle placement as much as you need to. With the non adjustable arms, caster has to be corrected with the cam bolts on the axle just like stock control arms.