I bent a guide roller holder on one of those big ones. I was able to straighten and weld it to keep going, but it got replaced. There are no hydraulics on the extension, so I used a Lull forklift for all maneuvering on the long ones. That one is over 47 feet, which is longer than I can saw, so there was still a lot of sliding to get it done.
Member, Timber Framers Guild