 And when they're vented, they're vented up into the body of the vehicle where they're out of the way and cooled. They shouldn't have that problem. But you shouldn't have an issue until you back into the water far enough where you're going to have an issue with the truck. If you're backed in that far and there's no water coming into the cab, you should be fine. But if you're backing in that deep where there is a problem, you're going to be getting water into the floorboard of the rear. The engineers should be embarrassed if they design a pickup truck