At first, Tsai and his father went about on bikes, then on motorcycles. At 16, he began to work independently, sometimes driving a small automobile for long-distance deliveries. He covered the areas of Taichung and Miaoli Counties.
剛開始，蔡進興跟隨父親騎腳踏車送貨，後來改騎摩托車，16 歲便獨立作業的他，遠途時還會開小廂型車送貨，範圍以台中縣和苗栗縣為主。