A receiver pin is provided for attaching a ball mount to a receiver on a vehicle. In one aspect, the invention includes a tubular member with an expandable portion at a lower end constructed and arranged to be expanded into contact with a previously expanded liner. A location data service collects such geocode samples and processes the samples to generate a reference location data set, such as a reference longitude and latitude and a zone of confidence around the reference longitude and latitude, for each unique point address.