here's how ?
Though my info may be a little out of date i'm guessin not much will have changed in last couple of years.
We came through Mongolia, Russia, South Korea then shipped in container to Long Beach.
We used Wendy at aerokorea 'AT' unitel.co.kr for arranging shipping out of south korea.
There was an easy to find imports office in Long Beach (sorry to be so vague) but i'm guessin you can find that one easy enough.
We handled all the import paperwork (temporary tourist import) for the vehicle there and then in about two hours with exceptionally friendly lady who was most helpful.
We did this on the friday BEFORE the ship had even docked (it docked on the Sunday).
We were not allowed into the port so your idea of driving out the container (as we also wanted) won't be accepted.
You have to arrange for a container collect and deliver to external port location. This was easy enough to sort but will knock you back couple hundred bucks.
Wendy (that korean shipping agent i mentioned) gave us a name and contact details for an agent in long beach whom we contacted for getting the container collected (i'll try to locate those contact details and repost later if i can find em)
So, just to clarify, we DID NOT use an agent in USA.
we COULD NOT enter port though so you'll have to get that sorted.
we entered US in November 2007 after 2 yrs on the road and hey guess what? we're still moving !!!!
Like your site.