Online shopping while on the road

If you include your RV park site number in your address, UPS and Fedex will often deliver right to your door. Those parks that don't allow it will usually accept packages at the office. As said, General Delivery works for regular mail, preferably to a small town PO rather than a large city PO. I've also used "Hold for pickup" for some UPS or Fedex shipments when there was an office fairly close.