24000 MI or 38400 KM

Lubricate
    Body and Frame
Check
    Fluid - Differential
      Check fluid level /check joints / check for leaks
Inspect
    Drive Axles, Bearings and Joints
      Inspect boots and seals for leaks
Replace
    Oil Filter, Engine
       Replace every 3 months or 3000 miles.
    Engine Oil
       Replace every 3 months or 3000 miles.
Rotate
    Tires
      Check tires and wheels too