I am in the process of deciding between the original B.O.B. Yak trailer, and the newer B.O.B. Ibex trailer with suspension. Has anyone compared these two trailers? I have heard that the Yak can start to chatter at speed over 40mph, and am wondering in the suspension of the Ibex allows for quicker (and safer) descents. Also, the Ibex weights almost 5 lbs more than the Yak, which sounds like a lot, but if the suspension is worth it I'm willing to adopt the weight. My main usage will be on road and light trail in both flat and mountainous terrain. Any info is appreciated.