Piggly Wiggly sign covers most of side of semi trailer, is lt blue background with white and yellow "piggly" head with hat on right end of sign. Lettering is mainly white. Several other delivery type trucks are also transporting weapons incognito across a dessert. Some signs disguising military trucks. All in a caravan. Seems to me it was around the time "One Flew Over the Cuckoo's Nest" was released.