It's normal but you can put grease on the hitch ball and up inside the receiver when hitching up to help keep the noise down a bit. (I have the two extra steel bars for the weight distribution hitch and they can make quite a ruckus during turns as they are metal on metal but we never want to grease them....only the hitch ball can be greases up.)
I keep a can of this handy with a rag inside of it for that.
Rick & Karen
(Retired USAF, MSgt)
5-year Travel Trailer RVers
2013 Forest River Rockwood Ultra-Lite 2904SS
2014 Toyota Tundra Maxcrew SR-5 TRD 4x4