on my last trip I noticed a clunking noise coming from my 5th wheel hitch every time I started or stopped. contacted a local RV repairman and was told my hitch head was probably worn. I purchased a new head from amazon and installed it on my hitch. hooked up the trailer and am still getting a clunking sound but not as bad. on my old hitch head I could see the hitch on my 5th wheel sliding on the top of my truck hitch about 1/4 to 3/8 inches every time I stopped or took off. on my new hitch head (curtis A16) I am still getting a slight clunking sound. is yhis normal?