very well could be; I had the Maxxis Razr MT on my Avalanche and had zero issues with those. I've be wondering if these were the cause of my current issues.
I was fighting with tire balance for a long time as well. Ended up switching to Toyo Open Country AT3s, and they balanced perfectly and got rid of all of the strange vibrations, etc.
Not an MT tire, but I know of lots of folks that love Toyo because they typically balance up well - even with the MT.