When new, I had a Ford chassis problem. The Ford truck dealer gave me a diagnosis I could not accept. It just didn't ring true. I took the motorhome to a private car/truck repair shop. When I gave them the written Ford diagnosis, they actually laughed. They fixed that problem for a reasonable price and I've been going back there ever since with any motorhome (chassis_) problems and also my car and pickup too.
Yes: I had to pay even tho i was under a warranty. But...the problem got fixed. So...my advise is that you might find a good truck repair shop. Someone you have confidence in is worth a buncha' bucks.....