I have 35" KM2's on my '77 K5 and hate them. Not only are they loud, but as they wear loose their balance rapidly (same with the AT's I had on the wife's Wrangler). Store guys have confirmed this to be a problem anymore with the BFGs.
In mud, the KM2's are great for the most part going forward, but lateral grip is terrible. If you look at the tread design, the goo easily channels across the surface. I got myself in a couple of scary situations with them. Oh and then you have to consider the premium price that BFG charges for them.
Not again until they do some redesign of their off road offerings.
You are 100% on being loud and dont forget not very smooth. I have 20K of hard miles on mine and I run at freeway speed with zero balance issue. About 5K ago I had them rebalanced and rotated for the first time since new
Also zero failures on BFG's