Since there is a thread covering our favorite trails and obstacles, how about one covering the most frustrating obstacle / trail ? I would list mine as Cable Hill @ Grey Rock, Rat Hole @ River Rock and Boat Ramp @ Chocco. I never made Cable Hill (two attempts), not enough motor or traction. Made Rat Hole once, broke the other two times and tried Boat Ramp once and shimmy shimmied all over, up down, sideways.