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I used the dual cam set-up for 13 years on a 31 ft. Airstream behind a 6. 2L Chevy. Worked great! My only complaint is, the torsion bars hung very low. Never caused a big problem, but did occasionaly drag when going thru dips, etc.
I use a Reese Dual Cam assembly and strongly endorse it. I have used it for years towing a 34' Airstream many thousands of miles. I use it now towing a shorter 31' A/S behind my Dodge-Cummins. The only draw back to a Reese Dual Cam is the clunking noises it makes when maneuvering at low speeds. On the plus side, you can back or turn at any angle you choose without the need to remove the bars as is required with a friction sleeve device. Another plus is the speed and ease of hookup. It is no more complicated or time consuming than attaching the chains to the flip over brackets and lifting the brackets in place.
I used a friction sleeve sway control device for years until I discovered the Dual Cam assembly at an Airstream rally. I went out and bought a used set of hardware to convert my old trunnion bars to Dual Cam and became a believer the first time I towed.
The issue of the trunnion bars hanging too low is a matter of the angle at which the hitch head is welded or bolted to the draw bar. Hitch heads are supposed to be installed at a small angle from the vertical, 5 degrees I think. If the angle is slightly larger it results in the trunnion bars being angled down more severely below the trailer a frame.
Go to: www.reesehitch.com. Click on Dual Cam Sway Control and you will find a good photo. The hitch or components can be ordered from this site as well. If you already have a Reese hitch you can add a new dual cam assembly to your existing trunnion bars for $156 from this source. If not, you'll need a complete Reese hitch head, trunnion bars, and flip over brackets.
RV dealers are frequently a good source of take off used hitch assemblies. When dealers take a trailer in trade, particularly when the buyer is trading from trailer to motorhome, the hitch sometimes stays with the trailer. The dealer removes it and tosses it in a back room and then offers to sell and install a complete new hitch system when the trade-in sells. I have seen used but completely serviceable Reese hitch assemblies for as little as $150.