Canada and Indiana

Can you mail a car? Further, can you mail a car internationally?

I have seen many unusual sights in my travels. Yet what I saw yesterday while coming home from a sales trip might qualify as the oddest.

Driving north on Interstate 75 near Monroe, Michigan I saw a Canada Post van. That was strange enough. But what really put the emphasis on the weird-o-meter was that the van, a Canada Post van I remind you, was towing a car. A car with Indiana plates.

So, can you mail a car internationally? Any of my Canadian friends have an explanation you might offer?