Trailer modification for PA 12

Hello, new to this forum and just got my new PA 12. Also just picked up a used jet ski trailer to haul it. I need to reconfigure the jet ski to fit my Hobie since the bunk boards did not match the hull. I noticed in the manual that came with it that Hobie says not to use PVC pipe to store your hobie. However, I have seen many trailers and some posts that advocate using it as the best method to use on a trailer. Guess I’m confused why Hobie says to not use it but so many people do. Any help clearing this up for me would be greatly appreciated. Thanks!