The Mastercraft Courser C/Ts are a great tire, but they definitely do "sing" when going down the highway. I had a set of the Courser C/Ts on my 2500 in 285/75R-16D and they were great offroad, in the mud, in the field, and on Colorado 4x4 trails. They were also very good for towing the travel trailer without getting 'mushy' and wandering all over the road. They were a little slippery on snow packed or icy roads though, sometimes even seemed to behave like a set of ice skates. Tread block size may have been just a bit too big for those conditions. In deep snow they were great, they kept pulling when the axles were pushing a lot of snow. Except for the groove where the rear pumpkin was, the tracks in the snow almost looked like a freshly groomed snowmobile trail!
I've got another new set of them that I'll be putting on in the spring, but for a winter tire I'm running a set of Firestone Steeltex R4S tires in 265/75R-16E, which are generally considered to be a fleet tire. How I ended up with them is another story, but I have been pleasantly surprised by their excellent performance on snow and ice. They also run MUCH quieter, plus my fuel mileage took about a 2 MPG jump.
I'm planning to get a set of steel rims for the Firestones and use them in the winter. I'll put the Courser C/Ts on my aluminum rims and save them for summer/offroad use.