Personally, I use a game cart. Like the Cabala's Super Mag Hauler and then put the dual wheel kit on it. Tow guys can load out a whole elk on it.
I have also tied it to my ATV and hauler elk out like that. I like the "one trip" idea.
But if you're in deep& steep, any pack frame is a blessing. My pack frame is one I got from Goodwill. Took off the pack the first day I got it and still don't know where it is.
I've taken elk in places where the best thing to is to just bring a knife and fork! Whew!