Not sure about weight capacity on the Nitto rack. The construction is pretty solid tubular steel. I think the weak point would be the lower mounting struts, though, so its flexibility in mounting options comes at a price. The most I've had on it so far is maybe twenty pounds. No complaints whatsoever at that point. Though I do have to say that my Tubus Luna rack feels MUCH more solid. Its posted weight limit is 40 pounds. I think it could probably handle more, but honestly I wouldn't want to be carrying that much weight around.