There was a bank in Amarillo, Texas several years ago that actually owned one of these buses. They had it set up so they could offer banking services at fairs, fests and other activities which drew crowds. Great advertising.
There was a British bank which was heavly invested in the Amarillo Bank and they sent a female rep over to discuss the business and the locals took her to the Airport in this bus which was named "Bob the Bank Wagon. The bank was eventually bought by another concern and Bob Disappeared. Pity.