Am I making a mistake going with a heavier, thicker bumper?

Thx, gdetrailer....that's what I needed....my issue, not being a 'metal' person, was the way-out-there idea that the extra weight of a thicker bumper might in and of itself make it more prone to snapping off at the welds when the rig starts boucing at 65mph just because it weighs more that what was originally there