Exempting an out-of-state dealer of Class M motor homes or Class G trailers from specified license requirements solely for the purpose of displaying and selling vehicles at a specified vehicle show in Wicomico County; authorizing specified out-of-state dealers and salesmen to participate in a specified vehicle show in Wicomico County; authorizing specified dealers and salesmen to conduct all activities involved in a vehicle sale at a specified vehicle show in Wicomico County; etc.