Kim, there are lots of options and you might read back thru the threads at the SSCA site as this issue is discussed there, as well.
Just a couple of thoughts:
1. However much of a logistics challenge it is to pick up mail while cruising the U.S., it gets immensely more difficult and expensive once you leave. Commercial firms who have done this for many years are therefore far more helpful a choice than Aunt Sue once you shove off for Mexico or wherever.
2. A cavaet for #1 above is that firms remain in business for long periods but actual ownership of these businesses change regularly; interview one of the owners (I''ve done this twice; well worth the time...) as tho'' they will be managing another valuable asset of yours in your absence, just like you would a rental property agent or investment specialist.
3. Reduce to the absolute minimum your dependence on mail. This may seem obvious and you probably already have some ideas about how to do this...but be relentless in pursuing other suggestions, ideas, alternatives. Some mail services offer a variety of related services in this direction, such as bill paying, parts ordering, etc. (at of course add''l cost).
4. FWIW a yachtie held a personal survey on the morning
VHF Net in Chaguraumas, Trinidad every morning for several weeks, inviting not just subjective comments but also a tally of who was using which vendors. I thought this was an interesting data point. The service which scored by far the highest # and also garnered what seemed to me by far the highest praise was St. Brendan''s Isle. (Our service, Voyagers, was an also-ran in both categories). We subsquently met Doug & Linda (SBI owners), interviewed them at the last SSCA Gam, and now use their service. This doesn''t mean theirs is the ''best'' but perhaps its one helpful rec. They have no annual fee and charge $12/month for their basic service. And they weed out the junk if you wish, which saves LOTS of postage once you begin forwarding.
Jack