That is my neck of the woods. Been hunting there for as long as I was old enough to hunt elk. Backpacking that area is a good idea, but better if you got horses. Good areas would be Adams Fork, Blue Lake, Kerr lake area and the toll road. Another good area is Saddlecreek or Lake fork. It is an old logging road takes you up behind the resevoir. That area is usually pretty good for elk. The whole unit and unit 80 have a ton of elk, but no real trophies. But then again in my opinion any elk is a trophy. I also wouldn't limit myself to Platoro area, look at Osier park(it sits on the border of CO/NM) Fox creek, and La Jara resevior. All of which are easier walking and contain about the same amount of people. No matter which area you choose to hunt your success depends on you. Hope this helps, if you want more specifics let me know.