A passing motorist said that he heard or thought he heard the brake drums scraping on our fifth wheel. These are never lube axles is this possible , if so what is the solution?
First you need to confirm what was reported. How fast were you traveling at the time? If highway speed, I doubt that noise could be determined. Were you maneuvering in a camp ground? If so, that's not totally uncommon at creeping speed; it could have been any number of those squeeking noises trailers make when maneuvering.