We just got through putting Trike Steering Solution on a 2018 Triglide that has the stiff damper that not adjustable. It made a huge difference in the ride. Here is the link to the YouTube video showing it in action. It's in my church parking lot so you can only go so fast, but it is for demo purposes so you can see how it works. It was a windy day, but when you are on a ride you will hardly notice the air compressor above the roar of the bike.
https://youtu.be/KaYmohO5hSg