This doesn't really relate to ham radio in the RV, and it's not in the same league as AA4PB's, but I'll throw out a recent experience I had.
My wife and I were just chatting in the shack/office/computer room one Friday evening a couple weeks ago while I had my 2m base parked on one of the local repeaters. All of a sudden a guy comes on and says he's got an "explosion and a structure fire" near a particular intersection. It took me a second, but I replied back, ID'd myself and asked him if he had a cell phone. He said that he didn't. At this point I wasn't sure if it was legit, because I had a hard time believing a person would carry around an HT with him, but no cell phone.
Anyhow, the emotion in his voice seemed real and I figured the safest course was to take the report at face value, and I called 911. He stayed with me as I relayed questions from the Fire dispatcher to determine the nature and scope of the explosion/fire. I ended up losing contact with him after the first police car pulled up, unfortunately, but I definitely count it as a success.