This highly depends on your preferences. However, it is somewhat essential if you’re out for longer and like to visit rugged areas. This configuration minimizes the risk of draining your primary battery and allows you to be in a comfortable state of mind while exploring. It is easy to recharge and discharge these systems depending on the kind of battery you’re working with too. The only downsides would be the cost and the added load to your van. You can risk not having a dual battery system if you’re traveling for shorter periods and in areas where you can easily access a power supply.