I'm an old-fashioned accountant. Just sign up for a mail-forwarding service. Some full-timers pick up mail just once a month. Others check mail once a week. The Escapees RV Club , The Family Motorcoach Association and The Good Sam Club all offer mail-forwarding services for RVers.
Customers pay postage costs plus any additional fees charged by the mail-forwarding service.
Fees vary widely. Many RVers coordinate billing due dates with mail pick up dates. It's awfully tough to pay a bill on time if you receive it after it's due. Travel Full-Time in an RV . It's just working with the companies.