Having been a mountain bike racer years ago and owning quite a few. I can tell you that a rear suspension bike is NOT what you want. You lose too much energy. Too much of your effort goes to pushing the bike (called bio-bounce) down rather than forward. Also, if you plan to carry out your game, you need to make sure you have the correct gearing. Make sure you have a "triple" up front. (Three chain rings at the pedals). ALso, you will want 29" wheels. The larger the wheel the lower the angle of approach you have which of course means it's easier to roll over stuff. There are several other things that I would suggest like, using an IGH (Internal Gear Hub) but those are pricey. The thought behind this is that in the woods, there are little grimmlins that can reach out and tear that rear dérailleur off the bike and then, your screwed. With an IGH, you don't have that worry. You also, don't have to worry about mud, sticks snow or ice mucking up the dérailleur.
Disc brakes are another that I would suggest. Greater stopping power and if you are getting out of control on a downhill with an 80 pound hog strapped to the back, you want to be able to stop when you squeeze the levers.
Aluminum is lighter and will be the predominant material used for MBs. It is very light but incredibly rigid, (read bouncy and hard on the bum when riding) Steel is real baby! Although heavier, it flexes more and thus gives a "plusher" ride. Also, if something happens to the frame or fork out in the field, it is much easier to find someone who can weld steel than aluminum.
You can spend anywhere from $78 at Wally's for a nicely painted brick that might get you to your destination or you can spend upwards of $6,000 plus. The choice is yours. For what you want and should get, I would say it's roughly $800 to $2,000.
I know...."you're out of your freakin' head!" But keep in mind that what I am proposing you get is something that will last FOREVER.
Here are some bikes I would recommend...
GT Peace 9er
http://www.gtbicycles.com/bikes/mountain/endurance/peace-9-r-multi Salsa Fargo
http://salsacycles.com/bikes/fargo/ Surly Karate Monkey
http://surlybikes.com/bikes/karate_monkey_complete/ Jamis Exile
http://www.jamisbikes.com/usa/thebikes/hardtails/exile/10_exile1.html Specialized Rockhopper
http://www.specialized.com/us/en/bc/SBCProduct.jsp?spid=52808&scid=1000&scname=Mountain I too have bee considering a "Hunting Bike" and out of the ones listed above, I would choose the Fargo.
All of the above bikes will work well with racks, both front and rear. There are a myriad of baskets, panniers (bags) that attach to the racks. Ortlieb make really nice ones, waterproof too! Make it easier to wash out the blood and all.
For trailers, I would look at the BOB trailer series. Great trailers.
And last but not least....for those nights that you just wont make it back (or don't plan to), you could always pull this....
http://midgetcampers.com.au/bushtrekka.htm PM me if you have any questions.
Eric