If you are tipping backwards, then drive in reverse. This levels you out and vice versa.

When coming off a really high jump and you cannot see any ground, lean backwards slightly to about a 45 degree angle. This can usually stop you from tipping over forwards into a hill upon landing.

If your truck is on its back, press both [Down] + [Right] or [Up] + [Left]. This will help you to get back on your wheels, but do not go too far.