Kraton,
I hunt with horses,and it takes a lot of gear to doit.For about every guy you need 3 horses,1 to ride,1 pack gear,1 pack in feed,and also animals.
You can do it with 2 if you plan on making multiple trips,and walk out.
Ansewer a few more questions for me are you going to a spike camp or are you packing in a tent,stove,cooking,gear ect.....
Dose the place you are renting from do they have the equipment for you? pack saddles,pannieirs,hobbles or are you running a picket line,rope,feed ect...
Some places requier weed free hay so you might have to pack in hay,or bags of alfafa blocks.You can also get away with letting them free range but you will have to put hobbles on them.

You might be better off going with a spike camp or have a outfitter pack your gear to your destination and hunt on foot from there.Then you can have them pack out your gear and animals,granted all this for a price.
If you are serious about packing you would be better off paying a good guide school 2700 bucks and learn the tricks of the trade,alot better than any book.
BBJ