We're looking into getting a rooftop tent for short trips where we're not going to tow our camper or want greater mobility (or to pull a rafting trailer), etc. One area I'm concerned about is the factory roof rack says the maximum capacity is 150 lbs, which will definitely not work, as my wife and I are about 330 lbs combined, plus all the gear. Does that rating only apply to the cross bars? I would think the parallel bars would be able to support more than 150 lbs. Or would I need some sort of aftermarket rack to support the rooftop tent?