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As you know, all of the boat weight rests on the keel rollers. Be sure you have Stoltz rollers on SS shafts, all well greased. My boats, both the 19 and 21 with same hull configuration, roll on and off the trailers with ease. Double rollers on each cross member highly recommended.

The side bunks, for which I use 2 x 4 x 5' are only for stabilizing the boat from rocking side to side, and all that is needed since you want to keep bunk friction to minimum. I put them under the hull where it is almost parallel to the ground, which means the top of the bunks are just about level on top. It seems to me that the farther out you can go, the more stability you get.

To install, first get the boat firmly resting on the keel rollers, and level side to side. Then do one side first, tightening the bunk bolts just enough so that they are tight, but can still be tapped up firmly with a hammer. Then tighten, and secure the boat firmly down to that bunk with a transom strap, or have someone stand on that side of the boat over the bunk.

Then go to the other side, and tap the bunk up tight against the hull. Now the boat will sit firmly on the bunks, but they will not be taking any load - just stabilizing. Be sure to attach the brackets to the underside of the bunk boards with SS lag bolts, 3/8" x 2" (use a lock washer under the bolt head). Galvanized will quickly fail and rust out.

I have found the best way to secure the boat to the trailer is with a 13' belly strap, run through the stern cleats on each side. Traditional transom straps don't work on this hull because the transom corners overhang the trailer by a foot or so.