With my last (08 6.4) and current (13 6.7) diesels I do them 2x per year. Once when towing season is about to start. We have a 38’ fifth wheel. And once when deer season is about to start. Basically when I’m swapping my road tires for my all terrains. I’ve never been comfortable going longer than that. I don’t put very many miles on per year but I’ve just always done it that way.
With my last (08 6.4) and current (13 6.7) diesels I do them 2x per year. Once when towing season is about to start. We have a 38’ fifth wheel. And once when deer season is about to start. Basically when I’m swapping my road tires for my all terrains. I’ve never been comfortable going longer than that. I don’t put very many miles on per year but I’ve just always done it that way.