Camber is personal preference. Generally anything over 1" should have them and I would say a safe rule of thumb is anything over 1.5" needs them. Basically, get an alignment, or just numbers first if you can. Just ask a place if they would put it on a lift and give you numbers for say $20 cash in their pocket. Then install your stuff and get another reading. Decide if your camber is too far out of spec and then you will know if you "need" or "want" a camber kit to adjust things one way or the other.