Just get a standard 4-way switch at the hardware store and handy box. Mount it next to the motor to control forward/reverse. Use the machines normal switch for on/off. Or add one if it doesn't have it.
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The above advice is wrong on every level.
First I would unplug everything and then start plugging them in one by one and see when it trips and go from there. GFCI protection is required everywhere in the garage regardless of heighth.
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Check out a Caddy or B-line catalog. They make a ton of stuff for supporting electrical equipment. All kinds of specialty beam clamps, Purlin hangars, etc. Shouldn't be much of a problem.
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