I put the red numbers 1143 on the front and back of the airstream yesterday. These are the membership numbers in the Wally Byam Caravan Club International (WBCCI). The numbers are used to identify trailers for a rally or caravan in which a lot of airstreams get together. Wally Byam was the founder of airstream and did rallies from the 1940’s. I have a book with all the numbers and the corresponding member.