I welded together a tripod stand on castors to roll around on the (then) shop floor using L channel steel I purchased from the local hardware store.since the siren came with no lower mount, I fabbed three brackets with holes drilled for mounting bolts, mounted them to the lower intake,then suspended the intake from above & laid out the tripod underneath making sure it was wide enough to keep the siren from tipping over when moving or operating.
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Sorry for the poor pic, it's up in the rafters @ present...