have to back up Phill, here I carry my boat and store it supported only by the beams front and rear. A lot of Aussies carry their boats on the beams and I have never heard of a problem. In fact "Altered" snapped a beam bolt but that happened on the water, but no problem on trailer. I think I travel more than the average sailor and living in the country, I get plenty of rough roads, do recommend soft springs though, many trailers springs are not designed for light weight F16's.
However I have seen fibreglass and timber boats blistered, where they rest on cradles on long Aussie road trips.
Hopefully you will find some photo's of my system attached.
