Super Steer is from Henderson's Lineup and I'm a big fan of Henderson's.
With only 5000 miles on my new DP I took it to their shop in Grant's Pass, Or. I had them perform their Road Test Assessment and then went with their recommendations for improving the handling of my coach.
They installed the SuperSteer bell crank and Motion Control Units and a Safe T Plus Steering Stabilizer. They also checked the alignment and took some slack out of the steering gear.
These changes turned driving my coach from a two handed, white knuckle, wandering challenge to a two finger relaxed experience.
I doubt that the bell crank or motion control units had much to do with the highway handling improvements. The MCUs do help a lot with the side to side rocking when entering/exiting driveways, etc... and the bell crank seemed like a no brainer when I compared to design with that of the OEM product.
Many will say that these products are band aids covering up other problems and I can't disagree with them in principle. However, I had taken my coach back to my dealer twice, to an alignment specialty shop once, and to a Freightliner Oasis shop once in efforts to improve the driving experience... to no avail. Everyone shrugged their shoulders and told me I'd get used to it.
So I can only say that I'm a happy Henderson's Lineup customer and 45,000 miles later I love sitting back and letting my DP cruise down the road only needing two fingers on the wheel to keep it going straight and true.
Best of luck.