Reach each checkpoint with your off-road Gavril D15 Marauder.
Be careful not to overturn on stones and inclined surfaces.
This scenario is very, very long and difficult. If it's to hard for you, you can allways try it in freeroam mode.
Your vehicle is equipped with a range box, which may be helpful. Downhilling requires gentle application of brakes. Locking your wheels may cause overturning forward.
Look around to locate the next checkpoint.