An unboxing video from YouTube member Michael19801234 of the latest Opteka SteadyVid Pro Video Stabilizer. The adjustable arch is a design used in some stabilizers to change the weight ratio - more or less bottom heavy. The lower the weight from the Gimbal, the more weight it should be able to support. Judging by the weights and distance, it should have no problems flying the 5lbs. it claims. Currently the Amazon product page has a special promotion for the free cleaning kit.
Opteka SteadyVid PRO Video Stabilizer