Hi Bruce,
I have the Kodiak gear but not the nice s/s stuff (came with the trailer, hence no choice). Mine are silver-cadmium coated, or at least that’s what I think they call it. After most outings/washes, I squirt a bit of lano on the brakes/rotors before reversing the boat in (without the brakes active) which gives the rotors a nice wipe over. The lano is burnt off within a few meters of use, and the rotors are as nice and smooth as the day I got the trailer. An option for you if you can’t justify the s/s stuff.
If you want pics for proof I can sort something for you. And yes, Don is a good bloke!
cheers
Brendon