I believe the rollers are just there to prevent the sharp bow from contacting the trailer crossmembers when loading and unloading the boat on the trailer.
They don't support anything, they just prevent damage.
Just a guess from observations of other keel rollers I have seen, one of the more experienced members will chime in shortly.
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2005 Grady White Tournament 225 with a 2011 Yamaha f250
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