guess these calipers are toasted..
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3 of my calipers appear to be totally frozen...I replaced one and rebuilt these three when we bought the boat. When I peeled off the dust boot, full of rust underneath. I the covers were cracked. I don't have a compressor to try and move the pistons but assume if I can't pry them out then they will not be in any condition to rebuild.
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Go Steelers!!!
Mine are UFP (Unique Functional Products) DB-35. $60 at trailerpartsdepot.com
Other brands are Kodiak, Titan & Tie Down Engineering. Other vendors are Pacific Trailers and Eastern Marine. I've replaced all 4 of my calipers.