Well, it appears from many of the comments I received this morning that the irony of a “wagon” carrying/pulling horses rather than horses carrying/pulling a wagon was lost on many of you! So, I’ll give you a brief history of “The Pony Express,” later to be known as “Wells Fargo.” Here are a couple of snippets from Wikipedia, followed by a link to a video of a song from the television remake of “The Music Man.” (The TV remake was significantly different from the original play and movie, you will notice, because it has an integrated cast!) See it through to the end, and you will see the WF Wagon coming down the street. . .
“The Pony Express was a fast mail service crossing the Great Plains, the Rocky Mountains, and the High Sierra from St. Joseph, Missouri, to Sacramento, California, from April 3, 1860 to October 1861. It became the west’s most direct means of east-west communication before the telegraph and was vital for tying California closely with the Union just before the American Civil War.
This original fast mail ‘Pony Express’ service had messages carried by horseback riders in relays to stations across the prairies, plains, deserts, and mountains of the Western United States. For its 18 months of operation, it briefly reduced the time for messages to travel between the Atlantic and Pacific coasts to about TEN DAYS, with telegraphic communication covering about half the distance across the continent and mounted couriers the rest. (It was shortly thereafter taken over by ‘The WELLS FARGO Company.'”)
Hope this answers your questions, and maybe helps you to understand why I, at least, found some humorous irony written on the back of a truck!
For now, from me, enough. . .