Believe it or not (and you should because I am telling the story !) but the other night I saw two guys transporting one of the huge frames on their motorbike.
The buses fly through the 40-50kph traffic with air horns blaring at about 80kph. If they had to stop in a hurry.....well actually they wouldn't be able to stop. But they are very scary.
Just pop the family onto the tractor and go to town.
Imagine those West Coasters driving to Greymouth on their John Deere.