Junk towing

towing junk vehicles

I have noticed one piece of junk car towing another piece of junk car travelling south on IH-35 many, many times. I wonder why I have seen so many of these vehicles during my stay in Round Rock. Some times, there is a small convoy of three or four vehicles. I suspect that Mexicans go buy used cars somewhere up north and then bring them to Mexico to sell at a profit. Any other ideas?