Oh man, If I had only caught one on camera a couple of years ago. The biggest tow company here in town had two break down in the same day. One at my scene. They sent a backup to haul a car away and they had their BIG flat deck stop to pickup the broken down wrecker. The big flat deck had one of their wreckers on the deck and they picked up the other one with the lift behind. One tow truck carrying a second tow truck pulling a third tow truck.