What to do with mail for six months of RV travel.

Get a mail forwarding address. You won't receive any junk mail. You can just let them know when you want your mail sent to you either at a RV park, if they allow it or have it sent to a SMALL local post office c/o General Delivery. Have it sent weekly, bi-weekly, monthly, etc. We did this for 16 years of full-timing. No issues. Even when you're home you can use the same mail forwarding company. Then you won't get the junk mail at home either.