I installed both front and rear on my 2015 30DS. I am pleased with the results; the ride is much smoother and feels more stable. My purpose in installing them was to get more control over side to side roll on narrow mountain roads; they work and I would do it again.
There's a bit of excitement going over bumps like raised railroad tracks and sharp dips in that the front tends to bounce up a little more than it did before; however, the bounce is only on the upswing and settles immediately when coming back down. It's not a huge bounce, but the difference is noticeable.
The drive feels and acts much more stable than before the springs, especially when driving in side winds and when passing trucks. I drive over a lot of two lane roads that a plagued by dips and uneven surfaces. i used to tense up when driving over those roads; I'm a lot more comfortable driving those roads now.
I installed:
SSF-184-40-1 for the Front
SSR-187-40-1 for the Rear (the upper bracket had to be mounted lower on the rear due to a 1" square tube on the frame preventing my mounting that bracket higher).
Talk to Gerry Lamberti at Supersprings International:
805 745-5553 or email at
gerry@supersprings.com He is incredibly helpful.