I remember some similar talk about fitting carbon fibre suspension to small asian trucks but they were worried about consumer resistancee rock said:A couple years ago, they were supposed to the the 'next big thing' for Jeep YJ's. It was a single tapered leaf spring that would, in theory, provide a continuously variable spring rate due to the taper. Sounds like a good plan, right?
I haven't seen them since.
Plenty of rocks in harbors and shallow waterways around here, and probably 90% fiberglass hull boats in those harbors. They're dragged over rocks by people who are not following the channels like they're supposed to..... but most boats sold in areas where there are lots of rock and a rocky shore are made of metal.