I run 315-75-16 on 8" wheels, too close to the fender to pput a snow plow on. I bet 305's would work though, my friends 99 had 305', 10 inch Weld rims, with out a level kit, and it looked like he could have put a plow on.
The Procomp all terrain. best tire I have ever run on a truck. 50000 mile tread wear, and I'm gonna make that no problem. best snow traction i've ever had, and best wet traction i've ever had. fairly quite on the highway. They're only a load range D, and I worry about them with the fifth wheel, so I am going to put goodyear duratracs on next, they have an extra 450 pounds a piece.