“Especially an 18-wheeler, they’ve got that massive radiator that weighs 800, 1000 pounds. Not necessary,” he asserts. “In those big trucks, they look at payload as their bread and butter. If you get 1000 lb. or more off the truck…”

Gallon of water is about 8.33 pounds.
Big rigs hold 300 gallons of gas.
8.33 * 300 = 2499

2500 pounds added to the weight. Sure you can remove the radiator and all it's components, but unless they weigh more than 2500 pounds.... it's kind of useless.