Probably have to break them down, rotors, dust shields, in one box other pieces in another. Just thinking out loud here. The flat rates can be up to 75lbs, if I'm not mistaken.
I wanted to send them as an assembly but I might have to pull them apart. Normally I wouldn't ship the rotors but these are nice and my helper they said were made in the USA. I haven't looked for the USA stamp yet.