Required! My husband and his cousins ride bikes and needed a way to get them to other places. When we moved from Texas to California we already had an issue attaching the cargo retainer so we knew how to attach it. super easy. My husband previously bought a rack lock pin because you don't want someone running away with the hundred dollar item we used for the bike rack. Seems pretty strong. As I said in my cargo report, one of them is that it's preferred for vehicles with a higher seating position. If you have a low sedan or SUV, you may scratch the floor a bit. Everything together is very strong and not afraid that it will fall apart.
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