Thank you all for your responses. Wiggle from side to side may be a good description of what I am seeing. No popping, grinding or creaking. Just a clunk as it reaches full extension. Seems to fit flush from inside when extended and fits the coach body well when retracted. I feel more confident about it now, especially knowing others have experienced similar operation. At the same time, I am very capable mechanically and would do an inspection/ adjustment/ repair as necessary. After 40 years in automotive/ light truck service departments, a slide mechanism would be a new experience for me. Close to making an offer, hopefully will become an Alpine Coach owner.