If you call Monaco technical help at 877-466-6226 they should be able to tell you who supplied the rollers. They typically have a drawing that they can email to you that would help identify the part. Mine were made by Cass-Hudson but are not the orange color.
"weekend tailgater" 2003 Fleetwood Revolution 40C, 2Vino Scooters hitch rack or H-D FLSTC & XL1200 So. Ga. Cargo Enclsd Trailer-Prodigy wireless brake controller