Abstract: An apparatus and system for positioning a trailing wheel behind a row planting unit in a row planting system and for transferring weight between a row closing unit with row closing wheels and a trailing wheel while providing for independent movement of the trailing wheel and row closing wheels is provided. A trailing or firming wheel assembly is positioned behind a row closing unit with a set of row closing wheels. A cam-based depth limiting system provides for a depth stop and depth limiting adjustments while providing for independent movement of the trailing wheel and set of row closing wheels.