concur with the previous two.
the stand on my 20 long had a bunch of surface rust on it. i took it out in the yard, gave it a good scrub with some steel wool and 80 grit, then re-sprayed it with some flat black krylon. looked nearly as good as new.
as long as the rust isn't compromising a structural component, or starting to swiss-cheese anything, it shouldn't be an issue. sanding and repainting should help stop it from getting worse, at least in the short to medium term.