I have a 2009 F450 DRW with 8’ bed. I have a BW under bed turnover ball and a BW 20K Companion FW hitch that hooks into the under bed system. The king pin is right over the axle. My FW 42’ and connected to truck is about 61’. I have never worried about legal towing length in states outside of where registered. If you double row, that might be a different consideration. I can measure the distance from king pin to truck bumper if you still want it.
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