Maybe we can find someone that has installed on a 47 so they can share any experience as well as recommendations and suggestions; we'll wait & see. When I look around my property, I'm amazed at how many mid sized rocks/boulders I have and with a thumb, they would so much easier to manouver & with so many, I can easily build a rock wall which is another reason a thumb would justify the $$ outlay.
Thanks
Eric