Go to your post office and talk to them. Tell them what you plan to do, and ask how to handle it.
If you know where you are going to be, file a temporary address change. I have had many changes during the winter, each time I went to the PO and asked for guidance. My mail always made it to me.
They don't forward junk mail, and magazines after a month or so, you will need to make an address change to the publishers, same with newspapers.
I am also paperless for about everything, sure makes things easier when your on the move.