the force is DOWN. This means about every 2 or 3 feet as you go back you should consider running a strap or metal or something from the frame of the car down to your strap. The idea is this will hold the cardboard up.
Otherwise you will have a piece of plastic hanging under your car suspended from the front and back of the car, with a big old sag in the middle.
The straps in the middle can be as simple as industrial zip ties - you want something really easy to attach and detach without having to rethread the entire strap.
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