I tow without a cover a well at least an hour each way and have never had the compartments come open even a little. I've towed over four hours @ 65mph and they didn't budge either. The way they close together is so tight i don't think they could.
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Mike - I think I have a solution to that plastic issue your having. I had a simlar issue. From what I recall, there is a large plastic nut on the underside of the engine compartment that you need to tighten, and then the whole thing should stay put when you twist the handle to open the compartment. I turned out the steel latch on the underside of mine was super loose too.
Yes sir you are right i did that near the end of last summer and works like a charm. Course it took the whole mechanism falling apart in the boat first LOL. Imagine the horror and embarrassment as i went to open my engine bay at the ramp to let it cool while cleaning the boat, with all the on lookers and the handle came right off in my hand LOL.