I had a set of AT2s on a camper van a few years back, basically an LTX MS2 with a more aggressive tread pattern where the sidewall meets the flat, and they had I think about 1/16" more tread depth than the MS2 out of the box. Still, they were quiet, lasted well past their stated life expectancy, and were great in snow, on those occasions where we needed a little extra help. Returned from one or two trips into the teeth of a blizzard up here. Installed at Discount Tire. Will continue to shop there, as have only had good experiences with them.
I think their latest and greatest product is the Defender, but I'm not sure if they come in a light truck version in a motorhome load range. They probably do. I haven't needed new tires lately so haven't kept up on the options.