Trunk center section
Greyhound at one time was awesome...however not as many locations participate in their shipping program as used to.
Definitely the only economically way to ship anything of this size.
The size and weight maximum dimentions are listed on their website.
The last thing I sold / shipped through Greyhound was a fiberglass hood for an early A-body and it was $100, but because of it's size took forever to arrive as they said they had to wait for the busses that could handle it (it was their maximum dimentions on the two long sides) and that bus had to have an empty spot for it, since it took up an entire cubby by itself.
It eventually arrived in perfect shape though...albeit about 20 days later.