My brother had his J/30 shipped from TX to WA. Trucking outfit messed up on the wide-load permits, so he ended up having to reschedule his vacation when they got delayed by state troopers en route. Not fun. Go with a reputable outfit, even if it costs more.
Just as an added note, since quality has come up, J Daniels marine transport took very good care of my boat and mast. A lot of help from Svendsens in Alameda as well. They just love what they do, so they charge honestly. They have shipped some fancy and spiff boats, pictures on their website show this.