I have never been a fan of rubber bungee cords. They have their uses, but they can be very dangerous.
The bungees, if they let go, which they can do at the most inopportune times, can cause damage either to a person or an object like a car.
Notice the duct tape on the back window of the vehicle. As guests were leaving our place on Sat to drive back to Wisconsin the bungee slipped and flicked up to strike the glass on the back of the vehicle. The glass instantly shattered and a bush repair was made. Fortunately no one was hurt. I was standing only two feet away talking with the guest who had the bungee miss his face by inches. Accidents tend to happen fast.
Ratchet straps do the job well and are much less dangerous. The vehicle parked right next to this one was being loaded too.
My advice, use ratchet straps instead of bungees.