I had one for 10 years and it looks like a RBW 15000 lb,I also had a little play in mine. I noticed that the straight bar started to wear a small curve in the bar where the pin
would always be resting on it. I think the flat bar against the curved pin will eventually wear over time and will give you some play.I just relaced mjne with a Curt Q-5 20000lb hitch. I love my new hitch,it has a higher load rating,and much quieter when nothing hooked up to it.It has a rubberized block under the head to keep it from bouncing around.I got it for 499.00 plus free shipping to the house which was a great deal.
2002 ford F-350 crewcab Dually
2005 Keystone Challenger 34 TBH