My guess: Big difference between those locking jaws on a fifth wheel hitch. Significant pin weigh on top of those jaws make it unlikely that anything would bounce out.. Most folks clip their ball hitches closed, and not much of a latch over the ball, makes it much easier for a bounce to cause the trailer/boat to come off the ball, and chains X crossed are supposedly there to catch.
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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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