Re: [idemallie] High Capacity Hanging Scale
If you are just slow pulling then a setup like that would work, provided you increase the load slow enough for the whole system to catch up and give you a good reading. That could be easy to set up or very hard depending on what you are pulling.
Stretchy stuff like long lengths of nylon webbing you could get away with a crank winch or a turfer/tirfor if accuracy is not that important, but with less stretchy stuff or if you want reasonable accuracy you have to consider that the difference between 50kgs and 1000kgs could be as little as 10 to 50mm of pull, and for that to work out you'd need a way of pulling mm by mm. A sort of thread/bolt type pulling device, something like a car jack or even a vice clamp could maybe be used for that with a bit of imagination.
As a side note, bear in mind that when shit breaks at high loads it whips like hell and pieces go flying like bullets, so try and set it up so that you are not in the line of fire when it goes if you don't dig the pirate eye patch look.
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Also, and completely irrelevant, check out the "Customers who viewed this item..." section of that product in Amazon.
Aren't those suggestions in Amazon tailored to your own search preferences? What does it come up with for you?