Hello - just picked up a nice 08 Tri-Coat White/Black Int Yukon SLT2. I am pretty happy with the new ride. I came from an 07 ML350. One thing that I'm wanting to do is make it quietter on the highways. In town it drives real nice, but on the highways getting next to trucks, other cars, and wind it's just louder than what I would like. Any suggestions? I'm looking into Dynamat, but not quite sure how much of a difference it will make on doing 4 doors. Otherwise I'll have to do the whole carpet as well. Thoughts? Thanks in advance.