Before you make the trip, consider when was the last time you checked or repack the trailer wheel bearings? At minimum, raise (jack) each tire clear of the ground so you can spin it by hand and give it a left/right hand shake, then up/down shake ~ HARD like it owes you $$$!! That way, you at least have an assumption as to whether the bearings are loose or not.
Then, as above members have said, slow speed trailer brake application with your hand controller to scrub the surface rust.
Good luck with the trip ~~
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