There are two methods to save your tires:
A. Stay way clear with tire sidewalls from any obstacles.
However, avoiding obstacles on a trail is like avoiding to deal with obstacles in your life:
Sooner or later they will catch up with you
B. Place the tire's tread area intentionally atop obstacles.
This is the professional's choice.
Dealing with obstacles by using this technique gives you maximum control.
Like in real life this guarantees that the problem is behind once and for all.