So those running the Tundra 5100's with 112-620 springs would want it on the 2nd setting for 3" of lift, and the Taco 5100's will want to keep it on the bottom.
again im running mine on the 4th notch, i have a bumper winch skids sliders and lights(im sure they weight like a pound each lol), and im at just over 3" of lift