Thanks all for the input regarding road noise, tires, insulation etc.
If we do ever look at one, I'm gonna have to take it out on the highway to listen. Some noise it one thing, but when so many notice it there must be something going on.
Geno
The desert is a true treasure for him who seeks refuge from men and the evil of men. In it is contentment In it is death and all you seek (Quoted from "The Bleeding of the Stone" Ibrahim Al-Koni)