Supra® S8 Unit. When you need a reliable solution for refrigerated transport of perishable and frozen foods in large-medium to large trucks, you need a unit you can trust. The Supra S8 unit delivers the powerful performance, capacity and efficiency you’ve come to expect from a name that’s been trusted for decades. We’ve taken one of the industry’s most proven diesel truck refrigeration platforms and made it leaner, smarter and filled with powerful advantages for fleets of all sizes. Innovative Design. Not only does the new Supra S8 unit look great on the outside with its aerodynamic body and sleek composite paneling, but the internal systems have also been redesigned to make it lighter, quieter and more efficient.