Because the big ones are threaded on they can vibrate loose. Have never lost one, but I check them when I wash down the roof. Have had to replace a couple of times, they don't hold up so well in the sun.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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