My 2001 Suburban 1500LT 4x4 has 84k miles. What preventive maint/ tune-up ideas would make sense? I want to drive it two more years and plan to take several long trips, so I want to take care of potential problems. Tranny flushed last year already, but no engine work has been done. I want to improve braking and handling if possible. What about new rotors/pads, shocks, etc. Looking for suggestions.