Hey guys, I was on my way home from a trip to CT to see some family, and I noticed that between 45MPH-65MPH there was a very slight vibration that I can't remember being there before. once I set the cruise control for 75MPH it was as smooth as can be. it's not a truck shaking vibration, just something I can feel in the steering wheel. the truck is a 2005 2500HD, it has 63k and about 25k on the tires. the alignment was checked a few weeks back and was all good. I'm thinking possible unbalanced tire or damaged belt? some A-hole let the air out of my drivers side tires a few months back, didn't pop them, but I did have to get it towed to have them re-aired, and this is the first time I've had it on the interstate since then. any thoughts?