On all the Sprinter-based coaches I've owned (3) the outside mirrors fold towards the rear of the coach. It takes quite a bit of shove, enough that one might think they are going to break them, but they do move in to just less than a 45 degree angle. There are two stops from fully extended to fully folded.
I went to the coach today and pushed hard on the passenger side mirror and it finally snapped back a notch. I sprayed the detent part with a silicone spray and moved it back to its original position and then back again. It has two positions back and one forward. After spraying the detent a couple of more times and working it through all positions it now moves as it was designed to do. I then went to the other side and did the same. I would suspect that the mirrors had never been moved before. The reason I was concerned is that I am going to visit my brother and his driveway is shared with his neighbor and the houses are only about ten feet apart and I want to make the coach as thin as possible when going between the houses to his back yard.
Thanks for giving me the courage to force the issue.