Reviewed By JASON H (Simi Valley, CA) —2/19/2015 10:40 PM
I tried the longer/higher ones and it was a disaster...my car had a tough time getting up, and they slid back, causing my car to roll over them. Since they were higher than my clearance, it cracked the rocker. Anyway, these things are dummy-proof. If you miss the mark, you just roll over them like a speed bump without hitting anything. I use four of these, and they work great!