Well, I got to take my Rebel on a 350 mile trip today. First real road trip had only driven it to home from the dealer 112 miles. Coming down the freeway about 60 mph I kept hearing a low pitched howling noise thinking it was a semi close to me but after the semi passed and was well away from me I still hear the noise, below 60 and above 65 it stops. Maybe wind catching some of the skid shield holes maybe? Anyone else heard anything like that on their truck?