It looks like the Houdini plugin is using an incorrect parameter for the RS Displacement and/or RS Bump Map nodes. This occurs in both H19 and H20 with Redshift 3.5.23. The Cargo Import log (in the Houdini Console) shows the following errors:

mat_surface setFloat: Invalid parameter name bump_amount

The RS Displacement nodes that are created have a Scale value of 1 which I think is way too high. (You won't actually see the bad displacement unless you enable Redshift displacement for the model--the plugin doesn't turn this on automatically).