If you want to put the MOC# on the flag (or trailer...got mine on), here's a idea. I got my 3" black Peel-and-Stick at Lowes for 54 cents ea. Located where the mailbox's are. Looks good, highly visible, cheap enough.
On the number list. While it's pretty cool to have a list of some 3000+ members and their numbers...the list won't have a great deal of relevance unless their MOC# is posted on the rig. I think that was part of the original idea.