Bill Lading-- 船荷証券is ok but 一般 we say B/L (ビーエル Bee-eru)
Co-load --- コーロード (koh-roh-do) Just like in English.
And Co-loader is not a really well-used word here. But still you can say コーローダー (koh-roh-daa)
If you really want to say them in Japanese ---
Co-load ---共同混載(きょうどうこんさいkyoudoukonsai)
Co-loader ----I made these words for you...共同混載者(kyoudoukonsaisha) or 共同混載相手 (kyoudoukonsaiaite)
By the way what is tradelink?