Why do people call trucks with 350\'s tow rigs? I am talking about all of the ads you read that say "Tow Rig" in the title. You click on it and find that it is a late 70's to 80's Chevy with a 350 V8. These are about the weakest engines in stock form. SO much smog crap on them they barely put out more power than a Ford Focus. Why do people call them tow rigs?