The thing I notice about wobbly props unless it's something like a tire hanging from a chain they don't always stay consistently wobbly. The first guy and the last guy to shoot off a T-post may not have the same level of stability after a day of the prop being abused.
Since this thread is about props and cut outs I will hijack it a little and mention a prop I made for our club I thought was fun.
I saw these pictures of loop holes in walls being used overseas in Iraq and Afghanistan:
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So I bought a sheet of composite fake brick board that looked like this and attached it to a plywood backer on a stand:
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I cut a loophole in it that looked like a few missing bricks and shooters stayed behind a line a few feet back from the board. Target acquisition and transitions were challenging but it seemed like a realistic and fairly practical stage. I personally hadn't seen it before although I'm sure it's been done.