I had a basic Eaz Lift WDH with two friction bars for the last two years, it worked ok, but, I still felt the trucks passing a little more than I liked. I have been reading as much as possible the last few months, and finally decided on the Blue Ox Sway Pro. I can't tell you exactly how it works, but I can tell you it works very well. We just got back from a 1200 mile trip and there is very little movement, if any, with strong winds or passing trucks. It is also very easy to assemble and set up. It took about 1 hour to get it set up. The hardest part was finding a torque wrench that I could borrow that goes to 450 ft lbs.
