Thanks for the compliment. I have a friend that has a loader on his Bolens G152 2wd tractor. The axle is stronger than you think. I try to limit my lifts to 500 pounds but he lifts more with his machine. He pushes his machine hard and has not had a problem in 10 years of use. Besides, the fun doesn’t begin until something breaks.
I built the grapple to handle fallen trees and brush piles around my property. I cut the trees down size before lifting.