450 hitch
My first thought would be to contact Reese and see what they say about it. My personal feelings would be that if the rails worked before with 4 bolts in the frame, then it may be ok. Perhaps the rails should have been replaced with ones to fit the wider 450 frame? I can tell you the B&W frame hitch for the 450 is different from the 350.
And as far as weakening the frame rail, I don't believe you would have a problem with another 2 holes thru the leg part of the channel--maybe a large hole thru the main part would weaken it, but not a 1/2" hole where there are already some existing. If those 2 holes cause a frame problem, we shouldn't be using that frame to tow these loads.
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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