Air ride!
I just installed an airbag suspension on my new '15 F350 dually and took it on the first camper trip. I will put at the end of this post the reasons for doing it to save the long narrative for those i...
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I think EarthRoamer use Kelderman, same type of 4 link. But since they start with a chassis cab 550, there are a lot more options. There are at least 5 manufacturers of 4 link air suspension for those. The Autoflex still seems to be the only one that puts the forces into the frame as the Ford Engineers designed. Most of the others support the weight right at the top of the frame hump, where it is weakest.
