New Year’s Resolution to Lose Some Weight? We can help! Face it, excess weight is never good. On your waistline, or on your trailers. We’re proud to announce that: SmartTruck’s TopKit Aero System, the industry’s lightest EPA SmartWay® Verified and C.A.R.B. compliant aero solution, just got even lighter! Now just 63 lbs. Another reason TopKit is a SMARTER alternative to side skirts. Benefit from 5.5% improvement in fuel efficiency. Installs in under 2 hours. And there are moving parts, no driver interaction, no undertrailer obstruction. Like every SmartTruck aero system, TopKit is covered by our remarkable LIMITED LIFETIME WARRANTY.