You're talking about a hitch rack where the bikes hang from their top tubes, correct? If your bike is the only bike that weighs over 30lbs and the total weight of all 5 is 150lbs or less, then you'll be fine with the Yakima. Just put the heaviest bikes closest to the car to minimize the stress to the rack. I could go through all the engineering and math related to stress, but basically, the effect of the bike's weight is multiplied by it's distance away from the car.