Not knowing mileage or standard maintenance of your tow bar, I would be leaning toward replacement or at least a inspection. When we bought our coach, the previous owner said he never did anything to the tow bar and it showed. We had the manufacture take it apart to inspect, clean/grease it. They pointed to several well worn areas and suggested a complete overhaul or a discounted new one. Maybe RoadMaster has a service facility you could go to? Plant tours are always interesting if you can get to them and they just may offer you a good deal on a new one.
Just read a post where someone had one leg of a tow bar come apart while driving down the interstate
(If you are looking for a new toad braking system, I use M&G Engineering and love it. So easy to hook up and go.)