I purchased my 2nd fifth wheel slightly used. It was two years old and had very little road miles. The previous owner had only towed it short distances and apparently used a grease gun each time he was preparing to go out. He had totally soaked the brakes with grease and there is no way to fix this other than replacing the brake shoes.
Do not use any method of greasing bearings other than removal and hand packing. Replace the seals each time. This only needs to be done on a yearly basis if you tow a lot or less often if you only go a few miles each season. Grease on brake shoes is very dangerous and destroys the shoes. It cannot be washed off with a solvent. There are numerous how to videos on youtube, this is not rocket science!!