We have had the discussions before on here about nylon straps for tire downs (Pros and cons). What happened below is why I will never use nylon straps on anything with wheels.Today in Indiana on a major interstate highway a one ton dually pickup pulling a 50 foot gooseneck trailer loaded with three vehicles rearended a semi that was stopped because of accident ahead of them. The three vehicles on trailer(nylon straped ) catapulted off trailer. One vehicle traveled 53 downa flatbed into back of the cab of semi and other two one on each side of semi. Sorry to say the driver of pickup did not survive the accident.