In Nevada, a handgun can be kept in a car or other conveyance (including, say, a pouch on a wheelchair), loaded, with a round in the chamber, anywhere in the state without a CCW permit, EXCEPT when on the premises of a school, library, day care facility, government building (post office, courthouse, airport, the usual places), AND on Tribal Land. A firearm cannot be taken onto Tribal Land.
In regards to private property, Nevada gives discretionary powers to the PROPERTY OWNER. A CCW permittee is allowed to ignore "no-gun" signs on all private property, but must immediately leave when asked to (otherwise it is misdemeanor trespass). As a right-to-work state, terms of employment proscribing a firearm on the premises is a matter between you and your employer: break the rules and you are fired. So let's say you work for a no-gun employer that is leasing office space (and therefore parking lot space, as well). You can legally have and leave in your vehicle a loaded firearm, because your employer is not the property owner. If, however, there is a stipulation in the lease contract banning firearms on the premises between the property owner and your employer, then your employer is acting on behalf of and respresentative of the property owner, and again you have not broken any law (except trespass if they ask you to leave and you refuse, like if they fire you). Of course, the whole point of a concealed weapon is that nobody sees it until you need to use it.
Nevada law also states that in the event of legal use of deadly force to prevent a felony from being committed or to protect yourself or another person/s from a deadly force threat readily capable of being carried out, the lesser charge of possession of a firearm where prohibited shall be dismissed. You have no protection against removal from employment due to your violation of your terms of employment.
By the way, these only cover legal possession if either a CCW permittee or over 21 and not a felon. Felon in possession is a different story altogether.
Best move: no-show, no-foul.