Making a 5 hour trip to N. Georgia and strapped two bikes on a trailer with e-tracks and d-rings in the e-track. Friend came to pick me up with strapped down bikes. With in 10 minutes, two d-rings had popped out of the e-track and the bikes were loose. We resecured bikes to trailer side rails. I wonder if anyone else has had issue with tie down devices used in the e-track? I wonder if the angle of the strapping had anything to do with the d-rings coming loose.