NC G.S. 20-4.01(27)d2.
Motor home or house car. – A vehicular unit, designed to provide temporary living quarters, built into as an integral part, or permanently attached to, a self-propelled motor vehicle chassis or van. The vehicle must provide at least four of the following facilities: cooking, refrigeration or icebox, self-contained toilet, heating or air conditioning, a portable water supply system including a faucet and sink, separate 110-125 volt electrical power supply, or an LP gas supply.
http://www.ncga.state.nc.us/EnactedLegi ... er_20.html
1 propane tank, 2 propane grill, 3 camping toilet, 4 propane fridge.. then call up your local DMV with these regulation numbers handy.