U.S. 20 runs straight through Stockton, and the strip of grass along a shop lot gets seen by everyone who slows for the light. Wursters Sales and Service, L.L.C. keeps those greens and the yards behind them mown, trimmed and edged on a schedule you could set a week by. Autumn is the long stretch, when the hills go rust and leaves bank against the curb faster than the wind can move them. Clearing them off, cutting once more, leaving every line where it belongs — that is how a block gets ready for winter. Come the thaw they are back, raking off what the snow pressed flat.