All my stuff is in 35mm.

I agree that 70s Eastman stuff is pretty bad, many original trailers are beet red. But Fujifilm does not fade like that. If stored & cared for properly, it just shifts a bit towards purple. I have an original SW 'teaser' on Fujifilm that has very vivid blues. Some of the regular SW trailers were on Fujifilm as well. I have one ESB on Agfa that looks completely unfaded.

The Eastman trailers are better in the 80s. I have some ESB and a Revenge that still have good color. All of the '82 SW reissues I have seen are on regular Eastman, not lo-fade, but they still look good.

If you want scans of the trailers, why don't you avoid the hassle of tracking down your own prints and go to a trailer archive? You'd get the best possible quality that way. You could get clips from the features as well.