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There are two bolts for each side of the bumper.  I really had to look hard to figure out which two nuts to loosen, but I think they are the only 1" nuts.  The bottom one was loosened with a 1" DEEP hex head on a short ratchet extension bar - the top nut was loosened with a 1" DEEP hex head on a long extension bar.

I loosened and moved one end, then the other.  I had to be pretty forceful to move the bumper lower and keep it there.

It was pretty obvious that the ends of the bumper were higher than the middle of the bumper.