One of my first exposures to rugby was one of those U.S. Rugby newsletter mailings. So, mentally, I'm a prop. Every prop I have spoken to about this says, for me, it is a real bad idea. My long legs are too well-suited to locking. So I play lock.
Props are often immediately distinguishable from their fellow players.
Since rugby is not yet the universal game it should be, there are a lot of people out there who are natural props but just don't know it. Well, since a picture speaks a thousand words, let's use a few. Go there and come back. Enough of my speculations. Let's hear from a couple of literate props.