I need to order a few last minute items before I leave but due to my rental month end closing in when I order I'll have to have them delivered to my destination post office or other available establishment. So has anyone been able to establish a destination US PO Box before leaving (in my case destination N. AZ) so items were delivered in a town near by their campsite? Or do you have to establish PO Box in person at destination post office upon arrival? I'd like to get these items asap if not at time I arrive. Or is there a better way to do this?