A camper van is no Cinderella's carriage ready to bring you home or to safety at will. You should be prepared for vehicle breakdowns by having roadside assistance services, knowledge of your camper van's systems, and the tools to check up and maintain common issues; Some good tools to have ready are items for tire pressure , the ability to jump a battery / battery maintenance. You will also need to make sure you have the proper defenses to protect yourself and others, such as alarm stickers to deter the curious, and proper clothing, bedding, or protection, to survive extreme natural elements. Additionally a carbon monoxide alarm is critical due to the small lived in space of a camper van, and maintaining ventilation is important at all times.
Cell phones provide a great navigation device on the road, and a signal booster only serves to help gain you that benefit when your local cell service might have otherwise been strained or non existent. You should still always be prepared with a map or road atlas as well. It is worth using one of the GPS applications that allow your fellow drivers to report activity on the road, such as the police, in order to get the best idea of possible routes to your destination with as few unfortunate stops as possible. I personally use Waze to find my directions, and give alerts to fellow drivers. Finally, phone apps serve as one my major sources for finding campgrounds or places to stay the night, with iOverlander probably being the most commonly used. Also, as an owner of a Wayfarers Conversion kit I have access to the Wayfarers App which lets me see campgrounds my fellow Wayfarians have approved.
In order to run lighting, or charge your phone, or keep your fridge going over night (or do all three AND keep a little warmer thanks to reptile heat lamps as pictured above) it is important to have an external power source providing you a source of electricity so you don't kill your camper van's battery by accident. For this purpose I use the 500w Portable Power Station by Jackery, which has proven faithful and reliable in running a variety of situations, such as the aforementioned. The station itself can be charged at a fairly competitive rate through one's camper van battery, or with Jackery's Solar Panels, allowing you to keep the battery topped off throughout your journeys. You can certainly keep the station powered by driving regularly, but if you are going to be parked for extended periods of time the panels are a great option.
There are many options when it comes to food storage, I personally use the 3 in 1 ICECO iCooler because it allows me to have perishables without any significant energy concerns, and without requiring ice. An additional travel cooler tote makes for a convenient storage of other great camping & road trip snacks, of which the various breads, crackers, and chips from the Schär brand are a mainstay in my van as they are wonderfully packaged for road trip usage, and are delicious gluten free (and usually vegan friendly) products that are gentle on the traveling stomach. Also, the company has a very far reach worldwide, making their products accessible and familiar wherever the road may take you.
The Wayfarer Kit in my camper van serves as a wonderful foundation to my organization through its various boxes which allow for a great amount of storage. However, regardless of whether I have the kit in or not, it is always best to have a minimalist philosophy when it comes to outfitting the camper van. The reality of the limited space one is working with prevents you from accumulating material. Solutions to the space issue include having your containers serve multiple purposes such as choosing a compact portable toilet option, along with a sealable reusable garbage tote, and using them for regular storage when they aren't being used for their primary functions, as gross as that may sound. Finally, and most importantly, maintain your organization on the road to prevent your camper van life quickly turning into a life of total disorganized chaos.
In light of the limited space in a camper van, and for the increased safety it will bring, adding under clothes such as socks, and other small items like hats, is always a great idea and will make a huge difference on a cold night, as will these warmer packets which will serve you wonderfully as a small heat source. Additionally slippers, along with at least two pairs of shoes, serves to keep everything clean as well as warm. One tactic I have found especially helpful is stuffing seasonal gear in small nooks, crannies, and cubbies, which can be found throughout the Promaster City, with an especially large one underneath and behind the passenger seat. Some other great ways to keep the van (and the crew!) clean and smelling fresh are cleaning wipes, both ones for surfaces and ones for the body, and essential oils which can be utilized in a variety of creative ways.