I have a lot of respect for Hendersons Line Up in Grants Pass Oregon. They use the Safe-T-Plus "140" series, silver in color, for Class C's. The unit is enough larger than the OEM Damper, so installing one calls for their bracket kit, NOT included with the Stabilizer itself.
I use "Damper" to refer to OEM-types, which are horizontally-mounted shock absorbers. A "Stabilizer" has Damping PLUS coil springs that push the steering toward center.
There's another device, Steer-Safe, that uses springs on brackets out at the ends of the axle. Those provide Centering only, but you can leave the OEM Damper in place.
Roadmaster has "Reflex" which is a Damper/Stabilizer similar to Safe-T-Plus. It uses one push/pull spring for centering while S-T-P uses two opposing ones. The S-T-P seems to be the favored unit.