A plow working a cul-de-sac at four in the morning is one of the loneliest and most useful sounds in South Jersey. Ground Troops LLC is out in it — clearing driveways down to blacktop, opening walkways, laying salt where a township street meets a private drive along Egg Harbor Road and beyond. When the ground is green instead of white, the same trucks turn to mowing, edging and seasonal cleanups. Both jobs come down to the same idea: show up before it becomes somebody else's problem. Sewell, Turnersville, Hurffville and Grenloch are all in range.