I use it on a fiberglass jeep for plowing. As you know, it's magnetic and won't stick to fiberglass, but if you buy a thin, rectangular piece of sheet steel the size of a lantern pole (15" x 10" or so), if you're going to hang the lantern from the roof, place it just put the sheet of steel INSIDE the jeep and it will stick to the roof just below the light bar and the magnets will hold the light in place pretty well. I wouldn't use this for highway driving, but it works great for slow plowing.
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