For two winters we did a post office TEMPORARY mail forwarding to a mail forwarding service. The service then sent our mail to wherever we were. Worked fine for us. It is a small town though and the local PO and carrier are very helpful and knowledgeable.
The reason for a temporary forward is that if you do a permanent one to a mail forwarding service you can't just submit a new change of address because that would route all of the mail sent to the mail forwarding service to your new address. The PMB (private mail box number) the service assigns you and uses for your mail means nothing to the post office.