A little Tire Meister love for the M55...
I've found myself considering the M55 again (had a couple sets, never kept them long). It's a rather old, simple design by today's standards, and I know they 'sing' a bit on the highway and they are expensive. Also, I prefer a bit more void, the S/T MAXX is a great example.
Yet, with my new MoPar Cummins running 18" wheels (I've not found a set of 17s I like yet) and liking the tall, relatively narrow stock size, 275/70R18, studying the traction tires in this size has become 'a job'. Plus, Les Schwab sells Toyo and I like the chain.
In the 275/70R18 size, the M55 is a whopping 33.6-inches tall, and has 18.8/32 of tread depth, those are nice numbers. Of course the M55 has the stone guard rubber down the center between the middle tread ribs, which makes the tread quite shallow there.
So many good tires, so little time to drive.