Rust treatment

I need to do some work on my camper trailer as it got badly stone blasted on our last trip and now has a lot of surface rust.

In general, whats the best for this type of situation, applying a rust converter or rubbing the rust off and applying cold gal?

I see all cold gal products state specifically not to use a rust converter prior to application of the cold gal, which is a bit of a bugger as applying both would seem to be the best of both worlds.
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