Actually we took a video of it pulling the former cedar tree out to send to my insurance company so they could see how this "home made" attachment worked and that it wouldn't be a hazard in use; so no "action" photos from this job. It would pull out the stumps not hooked up to the dingo (only hydraulics hooked up). All the forces are internal on the attachment. Mostly 4x2 1/4" wall square tubing with 3.5" bore 20" stroke cylinder and 1/2" grade 80 chain. The attachment weighs easily 300 lbs.
3.5" diameter cylinder x 3000 psi operating pressure from the dingo means MUCHO vertical pulling force.
My inspiration came from this website http://www.teamextractor.com/
Merged their 2 models to make plans for mine