Supra® S9 Unit. Explore a unit engineered for the reliable transport of perishable and frozen food in large-sized trucks. The Supra S9 unit builds on a legacy 20 years in the making with an innovative new design, superior capacity and performance you can count on. Quality Engineering. By streamlining the design and using fewer mechanical components, we’ve extended the service interval to 2,000 hours, increased the overall lifespan and greatly reduced total operating costs. Proven Reliability. The Supra S9 unit provides higher capacity, faster pulldown and a smarter, high-efficiency platform that ensures dependability and peace of mind.