Sounds like your friends are hunting 56 and 561? The boundary between 551 and 56/561 is one of the most vertical rugged boundaries in the state. Just mentioning that because though you may be hunting just one unit over, you probably won't have contact with your friends, at least not in the form of cell phones or two way radios and it would require some real driving and leg work should you need help from members of your party or vice versa. Sharing camp at the end of each day will certainly be nice if you can all find a central location that makes sense distance wise. Also, 3rd season weather can be full on winter at the top of Monarch Pass, which is basically right where the units come together. Be very prepared, and have a good lower elevation back up plan is my advice.