Trellis, as we usually see it, is not permanent for the larger climbers. As they put beef on, they pull it apart, wedge it away from its mountings, and you may have to chop everything back and start again a few years later. When you are a few years older.....

Climbers don't do wooden fences much good, either.

It sounds as if the mounting bolts of the fence panels are rusting out. As they do.