I try to use watts exclusively now since doing my first on our 92 Tow pig. It is a frame laying, 2.5" stock floor body dropped chevy crew cab dually. I Originally built it with a panhard bar but it was getting into the dually fenders.
A lot of guys will tell you towing and air don't mix but this thing is overbuilt and a triangulated 4 link wasn't an option. Watts were starting to pop up in the scene and so I built my own after talking to a few guys who were using them. Truck has about 25k miles on it since install and other than road grime still looked pretty new. We use it primarily to tow another extra-cab dually, a 64 impala, or 55 pro-street to shows.
here's a small pic:
