I have a 2008 Toyota Camry (Mid-size car) and would like to carry two canoes: 15 ft, 28" wide, 30 lbs; 16 1/2 ft, 36: 50 lbs. The rack (Yakima Q-Tower with a 66 inch bar instead of the standard 58 inch bar) is rated for 100 lbs and Toyota states the roof will support the weight. I'm wondering if this will work at highway speeds?