Donny, I've used these in the past.
It's funny how they call it "Hydraulic" / "Air Powered". Of course how can something that's powered by air be full of fluid???
Anyway I digress; I didn't own then, the guys in the band I was in had them. We also used them for a lighting truss. They work like magic, very durable.
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Al
Pa4x - LD Systems Maui 28 - Mackie Thumps