[Fr. Frank]

Spacing your trailer bunks just outside of and immediately adjacent to the vertical hard-chine of either of the two outer hull panels is good for earlier hulls. This is within 1" of either of the stringer sets on early 4-stringer hulls. Later 2-stringer hulls have the stringer at the middle vertical hard-chine, so the bunk needs to go there on those hulls.

Putting the trailer bunk outside of the chine where it is adjacent to the stringer will give the boat a good chance to self-center as it's being loaded. (This is how my trailer is set up, as seen below).

But the chine must be right up against the bunk to reduce load-induced hull flex and potential cracking.

Putting the bunk directly under the stringer inside of the chine is structurally the best way, but will often result in the inner hull panel falling off the bunk as you drive on, and you end up with your boat tilted to one side and off center. However, this tendency can be easily overcome by what Capt. Chuck and several others did: installing keel-centering bunks on your trailer to center the keel as the boat is being loaded