Just to add another thing to this excellent thread...
Folks looking to move a lot of weight via loader+pallet-forks need to keep in mind steerage. I've had my B7800 pick up a very heavy load (for it) to about 3' and the steering was almost impossible. While a tractor MAY be able to lift something I'm guessing that you really want to keep total weight to some lower percentage of max, perhaps 75% or so to ensure that you can retain reasonable response from your steering: of course, travel over rough ground further makes this difficult, in which case even less weight would be desired.