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I don't think you need (2) bars, but then you may need to support the end of the tool like was previously mentioned.
My tool came with (2) bars, which works great for the lug nuts, but it might not be standard issue.
I have not had to use a jack stand when using the multiplier feature. The 2nd bar supports the tool just fine, I usually put a piece of wood under the bar the contacts the ground.