NV 2.0 Add-OnOur NV 2. 0 Add Ons have impressive features worth noting when youre looking for a 3 bike or 4 bike hitch rack for your vehicle. The 1 Bike Add On increases the 2 NV 2. 0 to a 3 bike hitch rack that will carry bikes, including electric bikes, weighing up to 50 pounds per tray. Similarly, the 2 Bike Add On increases the 2 NV 2. 0 to a 4 bike hitch rack that will carry bikes, including electric bikes, weighing up to 40 pounds per tray. Attach our e bike