Des wrote:
We will be trucking a Wauquiez Hood 38 some 1500 miles using a boat
transport service.

Why? ISn't that contrary to the boat's intended purpose?

... The vessel has a centerboard. The trucking company
says the centerboard should be completely retracted but others have said
that the pennant is not intended to take the sort or road shock loads
that the centerboard might exert, and that the centerboard should be
lowered onto a relatively soft support, such as a softwood 2x4 placed in
the trunk opening. Anyone with any firsthand knowledge of how best to
secure the centerboard for the trip?

Sure. Both are right- the centerboard should be completely housed and
should not be resting on it's gear.

A couple of options-

....hammer a few softwood wedges up into the bottom of the CB trunk, a
pair at the fwd end and a pair aft.

....drill a hole thru the bottom of the keel and put a large bolt thru,
then when getting ready to relaunch, pull the bolt & fill the hole with
lead or f'glass slurry mixed with lead shot.

....lower the board enough to pull the current hoisting gear/pennant and
put on a new temporary one 10X stronger stronger, directly to the frame
& not the winch; then when getting ready to launch, replace with new
pennant/gear (overhauling the CB gear is necessary maintenance anyway).

Probably a dozen or so other ways to fix this.

Fresh Breezes- Doug King