You may want to consider shipping in an enclosed trailer. By the time you calculate fuel, trailer rental/usage, wear and tear you may come out ahead (and a lot less tired!)
I use Intercity Lines. They are very professional, use enclosed 53' hydraulic lift trailers and because they can haul several cars on one run, as long as you have a somewhat flexible schedule you can save money as well. So far they have carried my mint '66 LeMans to its new home in San Jose, and our '68 Firebird from L.A. to Detroit.
