Peter:
It's certainly possible to move it on a car hauler, but you (we) don't know if the pan's been shortened yet or anything like that, so we don't know if you can set the body on the pan for transport. I would also be really careful setting the body on to prevent damaging something in a move like that.
Just for info, the pan without engine is about 9 feet long, and the body is about 12 feet long. If the pan HAS been shortened and you can put the body on it and lash it down with ratchet straps, you could haul in on an open trailer. I would use four people to lift it, and have each person lift at the sides, just ahead of, and behind, the doors. That way it'll be balanced and you won't be stressing the front or rear sections. I just saw a '78 IM kit that looked like it had been raised by lifting at the nose and it now shows cracks at the rear base of the front fenders, just ahead of the door jamb. Try to avoid that. It's an easy lift for four people.
The rest of the stuff in boxes can be stowed in the tow vehicle.
gn