Jeff makes some great points. Another thing to check out is if you are using a shooting stick, a lot of them have forks that will unscrew on the stick. The screw is typically a 1/4 x20, which happens to be the threads in a tripod collar. Since it is hunting trip getting multi use out of some of your equipment is a bonus. Taking a couple of old empty pillow cases works great to cover your equipment during travel and then fill them as a bean bag. Jeff's idea of the rifle stock is really a great way of shooting long lenses.
Jeff, are you going on a photo tour or hunt. I look forward to seeing some great shots! You should take a photo of your set up over there as a demo.
