The inner dual tire on my rear axle recently developed a flat while stored here at home. I called CoachNet and they sent out Wingfoot, a mobile commercial truck tire service. I have never removed the rear tires, so I was unaware that the "Freightliner" emblem in the center of the rear chrome hub cover, was actually a large retaining nut for the hub cover itself.
The Wingfoot tech attempted to remove the driver’s side retaining nut, but could not get it free. He had no special tool for removing the large nut, only the large pipe wrench which I supplied him with. He ended up virtually destroying the surface of the nut and scratched the heck out of the hub cover. I told him to stop and that I would contact Freightliner for help. It was later after talking with Freightliner customer support, that I learned that the driver’s side hub retaining nut is actually reversed threaded.
I called Wingfoot back and spoke with a manager. The manager was very apologetic and sent another tech out to my home right away. This tech knew about the reversed threading and had the nut off in no time. He pointed out that the previous tech had damaged the hub cover, as the surface of the cover was partially flattened out when it was accidentally over tightened.
After the flat was repaired (ended up being a bad valve stem), I called Freightliner and got a price quote for a replacement retaining nut and hub cover. Armed with those amounts, I called the Wingfoot manager back and asked that the replacement amount be deducted from my flat repair bill. He kindly offered to tear up the entire bill, which was slightly more that the replacement hub cover and retaining nut. I was very happy with that offer.
*IMPORTANT* During this process, I learned that a fellow Rv’er invented a "Hub Nut Tool", for removing the retaining nut. It is made of injected plastic and will not harm the nut. In fact, it even tells you right on the handle, which way to turn it for each wheel. Everyone with this type of rear axle setup should have one of these in their tool box. You never know when you might need it for an emergency flat repair on the side of the road. I was lucky, in that the repair was done in my driveway.
Here is a link for more information on the Hub Nut Tool.
Craig