Update - booked-in at Knoxville CW, explicitly discussed on the phone the differential oil leak (where the propshaft enters) and sent them a photo of it 10 days in advance, they said no problems.
The job took 3 nights in a hotel rather than the agreed-upon 2, when I went to pick it up they had not even looked at the diff leak - said they couldn't do it - even though they said differently 10 days earlier. The service manager skulked away and hid, leaving me late to get to my meet-up in the Smoky Mountains and it clearly wasn't worth ranting at the employee.
I asked if they had at least checked the diff oil, he said they had.
That night I went under to check, the diff filler plug had not been touched in years.
4 days later when I came back to my RV (after sleeping in shelters on the AT) I had a flat tire - I had asked CW to install valve extenders on the back, clearly they did not do a very good job of it.
I'm done with CW, this is my third bad experience in a row - I'm not picky, but not answering calls or returning messages or not doing what they said they would do (after clear emails with photos to confirm) across three different CWs (they installed the wrong leisure batteries in California for me, then got annoyed when I asked for the correct ones, the ones they had listed on the emails from me and their internal work-order) seems to show that the service departments have systemic problems in customer service - poor attitudes and poor delivery.