I don't see how their visually mild difference would result in different ride characteristics from a well sorted "normal" leaf spring.
The way I would approach a low cost adjustable trailer suspension would be to use leaves under rated for the expected max load, with dampers, and then put a single air spring in the center of the axle. That means that the trailer frame has to be designed to have that significant load applier to the center of one of it's cross members. Best to do some engineering there b4 sparks fly.
Could even go so far as to use one of the Cad or Lincoln auto ride leveling switches if a compressed air source is available.
I used to swerve around my hallucinations, now I drive right through them.