Be more specific as to what you're trying to do. If it involves a lot of size or weight, I would get some ratchet straps bc rope is too dynamic to ever be tight enough to keep something in place for long. A lot of people underestimate the power of air moving across the back of a vehicle at speed and its ability to toss things from said vehicle at speed. Ratchet straps keep things where you want them to stay. But, again, I'm not sure what you're trying to accomplish.