Kuat Piston ION eBike Rack – 2″ 2-Bike. The Piston ION is built for e-bike enthusiasts who crave adventure. With a robust 100 lbs per tray capacity (adjusted for RV and off-road use) it securely carries two e-bikes on a 2 hitch without touching the frame. Its aluminum ramp and FastFit wheel chock system make loading simple while compatibility with RVs and off-road setups ensures its ready for any terrain. Designed to accommodate a wide range of wheel sizes and tire widths its the ultimate companion for any ride.