Miller Jeep Trail at Lockwood Creek, Frazier Park, California.

Lots of up and downs and switchbacks. Parts of trail can be pretty technical and will need seasoned spotters to guide you through. It's a very challenging trail that requires good ground clearance, decent tires, lockers, and recommend rock sliders; and also be ready to accept scratches all over as many parts of the trail are tight with dried up thorny bushes. Fun course if you like to be challenged; definitely not for beginners.