I'm not sure if you need 1/2 size smaller in length, but the Ariat Terrains certainly do run wide. I have always thought I has a wide foot, but my Terrains are so wide I feel like I'm wearing clown shoes. They also seem to hang up in my stirrups. I sure liked the concept of a boot I could also hike in, but I had to give up on the Terrains.
Schneiders has the Ariat Terrains on sale right now for $70. I usually wear an 8.5 but have heard the Terrains run wide - for those who have had them would you recommend getting a 1/2 size smaller than usual?