The underframe parts of a hitch are always installed on the frame--having the bed off makes it simpler for the B&W type hitches and others. Just talk to a hitch shop and ask/confirm what you can put on your truck.
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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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