Thule 926021 Velocompact 3-Bike Towball Carrier 13-Pin Black / Silver - One Size
The Thule VeloCompact 926 3-bike uses Thule's Hercules tow ball coupling, increasing the rack's load capacity and allowing it to be expanded to take up to 4 bikes (Requires adaptor TH926101), one of the few racks to safely do so.