2005 Trailblazer Luggage Rack Question

Kind of an odd question that I hope someone has the answer to. Does anyone know exactly how much weight and or wind resistance the factory luggage rack can hold on the roof of the 2005 Trailblazer? I am installing a weather instrumentation platform on the roof of the vehicle for storm chasing and wasn't sure if the factory racks would hold 40+ lbs of equipment at 100+mph windspeeds.

Got my answer from Chevrolet.. 200 pounds.. Thanks