If you focus on the southwest portion of the unit than having horses is the only way to go to pack one out. The rest of the area is covered by plenty of roads that can be covered with SxS or if you want to go slower, a truck. Lots of those roads end 6 to 10 miles from where you'd have to start riding a horse anyways. By October you could hear rumors of a bull 6 miles from such and such trailhead, so the next day you ride up there and don't see a damn thing. Then you find out the same bull was seen 10 miles away in a different drainage the next day by a certain road. If there with a cow than you may have a day or so. The only trailhead up there that has horse corrals is all the way up at Green River Lakes, which if the road is still in the terrible shape takes way too much time to trailer all the way up there when you'll probably be hunting further south of there. Just FYI, if you have to leave one overnight, be bear aware. I've seen plenty of videos of grizzlies on carcasses within a day of harvest that were filmed while sitting in a SxS or truck. Good luck with your hunt.