If it is possible, one could stack a few short 2x4's or appropriate material along side of the tire and just pick up the weight and set it on them, allowing easy fastening to the wheel.
Usually, but not always, plastic covered weights are cement, not cast iron.
but I don't, nor have I seen everything.
#75 is not that heavy, but trying to hold up the weight and carefully align the holes, without damaging the valve core, is a bit of a chore without help.
Much easier to turn the tractor on it's side and let gravity work for you.
Ha,LOL!
Edit: Roland types faster than I.