Nice! That pole worked out well for that job. That could have been 60 trips up the ladder if you carried the whole bundle.
I got to see how much my 644 would lift using wood pellets that I heat with. Of course, it could not lift the ton, which is a full pallet of pellets. I remember it did not lift a half pallet. I do not remember what I could lift. I moved the bags closer to the back to see what that did and that is where I do not remember the real world lift.
I have a 648 now. It would not have lifted much the way I got it. The main valve is bypassing at 1,500 psi. I rigged up a bench setup and pumped oil from a grease gun until the gauge never passed 2,400 psi. I have to put it back together to run it and see if it is set correctly now. I started out with the bypass screw just backed out a half a turn. I wanted to see what pressure the setup could withstand. Then I forgot I have a gauge that tops out at 5,000 psi. It did max out the gauge. The grease gun said it could do 10,000. Until this project, I did not know you could fill a grease gun with oil.
I never have a problem with rear weight. I have filled with Rim Guard 29x12.50-15 tires as my everyday setup right now. Back then, I had a 3-point and the loader weight box. I was also fast enough to buy 10-75 lbs of steel in the perfect shape for tractor weights, just a couple of miles from my house. The guy was selling them for $20 each. He had a lot more left, but they were gone by the time I realized I should have bought more to sell. Eventually, I still need to mount the outer combine weights in the stock back spacing 12" or 10" x 15" ag wheels. Whatever the correct width is. I was very happy to find that the combine weights do fit all the way in the rim. Once I get the wheel weights on, I doubt I will need the weight box.