My TT is an 2005 and overall good shape. The standard 15" white steal rims are starting to rust and make the trailer look older then it is. Are there any plastic hub caps that will hide it? I don't...
I just hit mine with a wire brush, spray painted them black with Rust-Oleumn paint, and installed new chrome center hub covers. It's been 2 years now and the rust has not come back. If it does I'll just do it again.
There is also a product called POR-15 that was made to paint navy ships. It's kinda expensive but once you paint it on metal it stops rust permanently. Then you can paint over it with any other color you like if you wish.