I would say the the RollNLock is the most secure cover on the market, especially the new A-Series cover. It's a retractable cover that has a tailgate hardware piece, it's the only retractable cover on the market with a tailgate piece. The cover locks into the tailgate as well as both sides of the truck (that's FOUR locking points). I've personally seen a RollNLock that someone tried to break into. They messed up the cover, but they did not break it open, I was impressed. No, I do not work for RollNLock.