Steady fast on mine. Easy to setup. My wife says they were the best mod so far. She didn't like the shaking. Pretty simple to install. I had mine on a previous 5er and took them off I liked them so well and put them on the new one.
We have had this stabilizer system for over a year. The installation was pretty straight forward. We did have to take our 2012 Keystone Cougar over to a welder and had him spot-weld a plate for the rear, due to the sliding bike rack. He was very cheap and had it done in about 20 minutes. I would also like to note that the developer of the Steady Fast system was available ON HIS OWN CELLPHONE, when we had a question. This is probably one of the best investments we have ever made for our rig. I love not having to yell at my 12 year old for running in the rig! When we are set up and the stabilizer is engaged, even an all American boy can't make it wiggle!