with the license plate bracket on with a stock bumper you don't even notice it's there. I took these pics kneeling down and you can just barely make out the tank below the bumper.
Also, here's an install thread I did.
http://67-72chevytrucks.com/vboard/s...d.php?t=197895
Most people install their tank with the straps perpendicular to the frame, but I wanted to be different
