Found this also,
Nevada law is silent on carrying firearms in vehicles. They do have a law against carrying loaded long guns in vehicles. But no law against handguns.
NRS 503.165 Carrying Loaded Rifle or Shotgun in or on Vehicle on or Along Public Way Unlawful; Exceptions.
1. It is unlawful to carry a loaded rifle or loaded shotgun in or on any vehicle which is standing on or along, or is being driven on or along, any public highway or any other way open to the public.
2. A rifle or shotgun is loaded, for the purposes of this section, when there is an unexpended cartridge or shell in the firing chamber, but not when the only cartridges or shells are in the magazine.
Nevada did amend their law to override local ordinances and that they must go by state law.