First Tim 5r dissapointed

I helped a man install the trailair pin box on his MS fifthwheel during a winter a few years ago. On the trip home they exoerienced chucking that was not before the air pin box. He was waiting for his wife at a shopping center and decided to look at his hitch. Trailer was at an rv park. He noticed the sliding bar was adjustable. He adjusted it later and not more chucking. We figured the air was allowing the fifth to float up and down on bumps and when the front of the fifth went up because of the air bag the pin would go back and then forward as the weight was lifted. No more problems.

chevman