You probably have a split duct design, with outflow on one side of the trailer and return on the other. The openings on the return side have the filters. Likely on the same side of the trailer as the entry door.
Dan is correct the filters are on the door side you snap off the white round plastic and they're the same filter material you would find in a standard AC roof return their washable and easy to replace just a lot of them from front to back.
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