So I decided I wanted to give my truck (Series IIa 109) a little wider footprint on the earth and am looking at going to a 265/75 16 on 16x8 rims. I believe that will have about the same diameter as the 235/85 16 I'm currently running but with a little wider stance. My truck is based in the Adirondack mountains where there is snow 6 months out of the year and most of my miles are on sand and gravel roads or logging roads. My full size Chevy plow truck runs Cooper Discoverer M/S tires which I swear by. Best winter traction tire for a fullsize truck ever in my experience. The maker says they are also a suitable offroad tire and they do have a E load rating. Aside from increased wear during the summer highway miles, is there any good reason not to run them year round? My total summer highway miles are about 30 miles per week. Any comments on size? Thanks