I should have read the reviewer who said shred the instruction book. I made the mistake of trying to follow the instructions. The book contains drawings of an item with a different number of straps so I was confused at best. I tried to attach it in what seemed an intuitive way. I thought things were fine, put two bikes on it and started on a trip. I was fine the first mile then got on the highway. I fortunately was not far from the next exit because by the time I got off the highway a half mile later The rack was in a very different position. I fortunately can get the bikes in the back of my SUV and had to put everything inside to get it home.I am reasonably literate, I have a PhD so you would think I could attach a bike rack. It suggests to me that the thing was not well designed.