I have a float on trailer. My 23' sits on a lift so I cannot walk on out and take a measurement.
I can tell you that the bunks are set so they are under the stringers and placed just inside of the chines. 55 1/2" apart.
A contoured guide between the bunks that the keel sits in, keeps the hull centered.
The forward suport bunks are the only ones that are near the keel.