If you ever kill and butcher a moose, you'll discover just how hard it is to find a way to get all of it well up into a tree or trees away from predators. I personally have yet to see anyone do it, or meet anyone who has done it. The primary problem is weight of the meat bags. The secondary problem is where to hoist it, while #3 is how to do it 8-10 times.
I have used a variety of methods. My favorite is to find 2 or 3 trees in a tight group and erect horizontal poles between the trees. I put the poles as high as I can reach from the ground. Then I simply run loops of cordage around the pole for hanging the bags of meat.
I bring an electric bear fence with me and use it to encircle the meat area. It's not a bear-proof situation, but nothing really is. And personally, I think meat kept closer to camp is less likely to be bothered versus having it out there 100 yards or more away. One thing I try to do is keep my meat in some place where bears don't naturally wander through. For example, I don't hang it along the banks of a stream or near a travel corridor.