Also read the exemption section of the definition of resident. Basically a seasonal visitor or tourist person in Nevada. f you vote, reside, own property in another state and "reside" ther by definition you are a non resident visitor to Nevada. I doubt that a local ordinance in Las Vegas could usurp the state law for long.
Now if you are living in your rig, employed in the state, put your kids in school than I can see how you are no longer a resident of the state your rig is licensed in and local-state fees and plates are justified.
Otherwise all hotels and RV, (not Mobile Parks) collect a Transient room tax to cover the services you require as a tourist.