Welcome to the forum.
Don't know anything/can't actually help with your question--but have you looked at the B&W hitch that is made for flatbed use? They might be able to help answer some of your questions. I think the website is www.b&wturnoverball.com if not, just google B&W hitch.
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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