I built a split lid for my trailer and used it to hold the lid parts. They are ideal: Spring-loaded locking mechanism. Pull down for a firm hold. Plus the ability to add a lock. Others like this don't have a spring-loaded locking mechanism, so there's a chance they will open in the right situation. You will not. The only minor complaint I have is that the locking mechanism is a bit difficult to use. But considering the benefit, they are worth it.