Saw mention of this on a youtube video and it sounded like a good idea. So I got some 3M NVH dampening material
Link. It needs a double barrel caulking gun and mixing nozzle (included with the material). The hood skin on one side of my hood was contacting the reinforcing bow and would have rattled pretty badly. I used some wedges that I had to make the gap between the skin and reinforcing bow.
The stuff applied pretty easily with the gun (borrowed from a friend), then smoothed off with a finger.
I plan on using the same stuff between the cab back and stiffening supports where there used to be webbing.
