If you're a digital nomad working from your van you'll need some way of connecting to the internet.
We've always used our mobile phones as 'hotspots' or used a location's wifi (such as a fast food restaurant or campsite we're staying on). Both these options provide enough bandwidth for doing simple things online such as checking emails, writing our blog posts, or watching videos.
If you want to do more, such as hosting video meetings, you'd need proper wifi equipment such as a dongle and router.
The guys at Technomadia have some great advice, especially if you're in the U.S.