KEEP YOUR VEHICLE GUNS SECURE
A wide array of vehicle safes are on the market, including excellent ones from Gun Vault, Titan Vault, Gun Casket and Safety and Security (Truck Bunker.) To actually choose one, you will have to search for one designed to fit in your vehicle.
Some are designed strictly for locking up your pistol if you have to leave it in the vehicle or to lock up your larger spare pistol when it is in the vehicle.
Other versions are designed to take a carbine or shotgun. There are also internal roof racks of the type used in some police patrol cars that allow the rifle and/or shotgun to be carried above the windshield or further back on the roof. Because the weapons are visible if someone stops to look into the vehicle, these may not be the best choice for daily carry of weapons, especially in an urban area.
Other vehicle safes/weapons containers are designed to fit in the trunk of a vehicle or the bed of a pickup truck. These offer a way to securely carry long guns and possibly an extra handgun secured within your vehicle, but they do not offer ready access when you are driving. My advice is to Google “car gun safes,” “vehicle gun safes” and other variants to get some idea of what is available for your vehicle and in your price range.