I have 109k miles on my 99 4Runner. Shocks and coils are original equipment; never changed out. They feel soft to me and there is some sag in rear. I don't need any more lift but I would like to stiffen up the ride. I'm on pavement 80% of the time. The rest of the time on forest service/logging roads and a lot of corduroy usually w/ fairly light loads. Any suggestions for kits? Thanks.