
I bought the straps assuming they were fairly tested based on reviews although thought there might still be some movement as there is only one vertical strap is down. On my first trip I used them with my truck and they did the job. The next trip I took with my car on a trailer, I checked regularly throughout the trip that they were still safe and not moving. I didn't notice any change during the whole ride, which lasted about 7 hours. About 5 minutes from my destination I had to lock the brakes to avoid a dog standing in the middle of the road at night. The next morning as I was about to unload the car, I noticed that the car moved about a foot forward and ran into my mower, which was also on a trailer, damaging my bumper. I won't trust these belts anymore. If I ever use this again I'll have to use a strap to attach it to the chassis as well. I do not recommend!