Supra® S7 Unit. Confidently transport perishable and frozen food via medium-sized trucks with the Supra S7 unit. With first-in-class architecture and a high-efficiency design that looks great on the road, it’s the perfect way to add value to fleets of all sizes. Lower Cost of Ownership. By reducing the number of mechanical components and with fewer parts overall, we’ve eliminated many maintenance items that can cause extended downtime and repair costs.