4 miles in and hunt from there will be tough to get the bull out before he spoils.
I would be very surprised if any of your brothers buddies help you out. 4+ miles at 10k feet with 80 or so pounds is BRUTAL. It takes a really good friend to help you with that. Be careful counting on people to help you out, most people are all gung-ho till it's time to put the boots to the ground. You don't want to be packing that guy by yourself. Probably 5 trips minimum.
I hunted the Craig area a couple years ago and there isn't much public land. Nice country with quakies and oak brush.