Hunting from a ATV isnt called hunting its called driving!! It will be a cold day on hell when I have to bring an ATV out to hunt from, or to get me to an area. Horses are the way to go.
As you can see there are some dense evergreen tree patches on the sides of the buttes, well thats where they tend to bed down during the day. But you can catch them bedded on open faced buttes and thats how we got my Dads big one. We caught him sunning himself on a cold morning. I bet he wished...