Seatrade Reefer Chartering operates around 130 fully refrigerated vessels or reefer vesselsz, purpose-built ships for ocean transport of perishable and frozen cargo. (http://www.seatrade.com) Seatrade Reefer Chartering operates around 130 fully refrigerated vessels or reefer vesselsz, purpose-built ships for ocean transport of perishable and frozen cargo. (http://www.seatrade.com)