Ours was trucked to PDX from Oakland. It was a 'standard' over-the-road sailboat trailer - pulled by a Class 8 cab - where the bottom of the keel is not too far above the axel travel-limit point, is what I recall.
The mast was carpet-padded and plastic-wrapped and placed in a set of holders on the trailer frame, beneath the turn of the bilge. I recall that there was no question about overhead clearance. The spar is about 54 feet long overall, "tall rig", if they ask. You will check this before getting the bid anyway.
The pulpits and stanchions were all left on. I did remove the stern radar mast, of course.
A friend with a small pickup and canopy helped me with many of the "loose" parts, and we drove this lot home in one long 12 hour day. Spinnaker pole, radar pole, boom all on a rack on top, and a lot of rigging and misc parts from the inside of the boat packed inside our canopy.
Pad the heck our of anything and everything inside, and tape hatches closed. Vibration IS the enemy. Have your insurance binder in hand and do not totally depend on the trucking company for insurance, altho they will have some.
Try to be flexible enough in your timing that you can get the cost reduced by half.... IF they need to move the truck-n-trailer for another full-pay customer, and are wanting to make an "empty back haul" pay off. I was able to do this, and saved about 50% off the initial quote.