Nice. Reading I was picturing it on the back, then the pictures. I need one of those. I burn some but chip most of my brush, move rocks like you show (still need the chain to get them out of the bottom of post holes, and a lot of firewood up to 12' in length. What HP is your tractor? I've got a 35hp JD.
Chipper is next on my list... I am jealous of your woodland mills.
My LS is a 35 HP. I get 1688 lbs of lift at the pins (Wish I had more). The Grapple weighs 360 so I should be able to lift around 1300ish give or take (at the pins).
It takes a pair of front remotes to use the grapple.
My tractor has 13.7 GPM of flow, 8.2 to Implement as I have a hydrostatic tractor. It operates the grapple with ease. I like the independent top clamps - The both drop at the same time, and when one meets resistance, it stops. The second one continues to drop until it meets resistance. This way you only need one pair of remotes. Pretty cool