from what i seen on the tnn trucks show, they put one on the cap roof of a s10 pickup. then they showed the bigger guy(the guy who is still on the show)sitting on the rack. so i would say atleast 200lbs. BigDodgeDiesel from the off-road.com site has one on his fiberglass cap, and the one picture he has, has his spare 38" superswamper in it with some other gear.
i hope that gives you an idea.
the company truck i had at my old job had the yellow hazard lights on the roof(a 98 chevy 1500), it had j hook the attached to the inside jamb around the top of the door and used something like a turnbuckle to tighten it up.
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