Some of the walk-in areas are lightly hunted. I don't think too many guys want to get more than 1/4 mile from their truck (lots of them don't want to get 50 yards from their truck!). It is common to drive around and spot pronghorns from the vehicle and then stalk them if they within fairly easy walking distance.

Check out the rules for walk-in areas (usually no camping, etc.). The following link will give you maps by county:
http://wgfd.wyo.gov/plpwhmprogram/fr...ntingHome.aspx

When you buy your point you will get a Sportsman ID number. You don't need to choose units when you buy the point. When you apply for the actual license you can put a group together, pick a unit, and apply as a group.