Happened to us once several years ago, back when we had a Ford Excursion (with the huge mirrors) and a 34' TT. Wasn't on the road and wasn't a truck, though, it was another RV and happened at a campground front office.
We were sitting, parked at the front office at Ocean Lakes CG in Myrtle Beach, SC. Had just got there and finished paying for our site, was fixing to head to our site. I walk out of office, right as this big MH is passing by us on the left. It starts to turn to the left, swinging its back end to the right, toward our truck. DW is freaking out, saying he's gonna hit us. Before we could stop him, say or do anything, sure enough, back end of his MH caught the truck's drive side mirror.
He got it much worse than we did! Did ZERO damage to the mirror or the truck. The mirror just pivoted forward (those mirrors on the Excursions will pivot forward or backward, great mirrors!). It was able to pivot forward enough to keep from doing any damage to the mirror at all. All I had to do was put the mirror back in place. However, the contact left a nice long black streak across the right side of that Motorhome!
I never could get the guy's attention, nor ever saw him again. He left off into the CG sporting a nice long black streak across his Motorhome. May well have washed, buffed out, I don't know. I'm sure it made for some 'interesting' conversation when he got to his site and found out what he'd done. :)
Ever since then, we always use Ocean Lake's 'express check-in' service whenever we go there, so we never have to stop at their front office to check in. Just soooo many RVs coming through there all the time at that place (its a huge, very busy CG), very easy for that to happen.