Thanks for the information. I have read a few articles about how they can do damage to the hull...Can't be any worse than the what those oyster beds do :-).
I found a few that have the mounting hardware on the sides of the bunk, which would prevent to screws from backing out and hitting the hull.
Anyone use these?
http://www.trailerpartsdepot.com/ite...=86162&eq=&Tp=