Drive your truck as fast as possible and get to the finish line in the least possible time. Make sure that you are going to pass all the obstacles that are trying to hold you down. If you can't at this time, then you can always rely on the restart button. Adjust the settings of your truck until your truck can handle the terrain that you are in now.
Drive your truck as fast as possible and get your truck to the finish line the soonest you can. Try not to leave any cargo behind, but if some of them fall then just leave them alone and go on your way. There is nothing that you can do in such case.