To the outside world it looks like your permanent address. I use mine to buy health insurance through Obamacare and also have registered my car to this address.
The other big annoyance about living as a full-time nomad is laundry. So far I've managed with a mix of laundromats, laundry shops, and the occasional hotel laundry when it's reasonably priced (rarely).
I find dry cleaning to be cheap compared to the time I would spend doing laundry activities.
Ironing an expensive dress shirt with a rusty iron at an Airbnb is not something I want to entertain.
I haven't found a good solution for workout clothes though so I usually stay in an Airbnb with at least a washer.
More info / Wirecutter review: https://thewirecutter.com/reviews/best-mens-and-womens-under...