If you have the vehicle insured, make sure the coverage will also include the contents. Then take digital photos and keep them at a safe location, not in the vehicle, where you can access them should you have a theft, water damages, or you experience a fire.
You can also rely on flameless candles to help you create the atmosphere you want without any risk. They never get hot and they will continue to offer hours and hours of light when you turn them on. They are LED battery based so they don’t use much energy to keep them going.
Rotate your supplies so that nothing expires. When you buy new items, move other items forward and put those in the back. This way you always have a system for what you will use. Have a calendar that you use for maintenance and for battery changing schedules. Speaking of batteries, always make sure you have plenty of extras on hand for the various devices in your vehicle.