I spent the last three days hauling an elk out of the backcountry solo. Over five miles and 2000+ vertical feet each way. No one is saying it is easy, but a boned out bull can be packed out by one person before the meat spoils. Carry game bags, at least get the quarters off the body quickly, and keep in the shade. Boning helps, but it is most important to get the quarters of the frame, and all the loins, loose meat etc. removed. Even in warm temps meat won't spoil very quickly if kept in the shade in game bags. Due to distance and terrain, it was a 7 hour round trip for each load, and a large bull requires 3-4 loads in the 100 pound range. Just plan to sweat a little, and you can get the job done.
llp