Joe,
I recommend purchasing a cheap truck down here in cali. See if Wyoming has strict smog laws. If they dont, buy a truck that wont pass California smog. Since you are moving to Wyoming, you for sure might need a truck to begin with. So purchasing a cheap truck down here in Cali may be the ticket.
Also, you dont NEED to take your Z with you on this trip. Im sure there are cool enough guys on this board that will let you park it for a few weeks at their place. You can then get a cheap one way ticket and fly down, and drive your Z back home. All of what i mentioned is probably cheaper than renting a truck from a rental store.
Good Luck