Thanks philagony! I am on my second set of STT's and love them, but I've also had them on full sizes (78 Powerwagon and my 03 Duramax) so maybe they ride better with the heavier trucks. I commute about 80 miles a day, half of which is on hwy. While they are noisy, I consider them on the quieter end of the spectrum for a mud tire. They are indeed a heavy, meaty tire though, and I can see them causing smaller trucks to feel a bit sluggish. They're performance on dry pavement hasn't left anything to be more desired for a mud terrain, but they obviously don't handle like a street tire, that's to be expected. I personally have not noticed any vibration from my tires, but did note they took a good amount of weight to balance.
May I suggest looking at the cooper discoverer M+S.
http://us.coopertire.com/Tires/Light-Truck/DISCOVERER-M-S.aspx?tab=2
I've had 5 sets of these tires on: 84 Cherokee, 95 chevy 2500, and dodge 2500 ctd. These tires wear like iron, have excellent traction in all weather, and perform great when aired down. I never got below 60000 mi to a set, except for one, (and those are one heavy trucks) with approx 30% of miles being heaving towing. I had a bad sidewall gash in one tire that I got at nearly 48,000 miles, cooper replaced 2 tires, and I bought two more. Their only downside is not having any sidewall traction, but I would highly consider these tires again if I didn't want the m/t. I've used them in deep, clay like mud, sand, silt, snow, ice, wet rocks, dry rocks. Look forward to more reading on this thread!