my advice is: DON"T GO SHORT ! I would say a 10footer or longer would be best. Try to find a place you can "test drive" one first. My wife has one from Wilderness called a Pungo. I don't think she could tip it if she tried. It is either ten or eleven feet long. Easy to paddle too.Hauling gear? Gun and shells might be easy. Dekes??? I don't think I would stack it on top of the deck. How about getting a concrete mixing tub from a home hardware store. They are like small rectangular boats. Tie a rope to it and drag behind the kayak. (My brother and I use these on managed areas where we walk in. Store dekes in it then when empty, place your gun in it while waiting for daylight.)Practice getting out of it - and waders will make it more interesting. Be sure to get good paddle and a life jacket. Life jacket needs to fit well under the arms.
if it was me i would get a beavertail stealth they are made for duck hunting. molded in gun rack holster thing and molded in decoy holder for i think 6 but the have a seat option of a second one look very stable and they also make blindrs for them in the event you like it and do want to huint from it.http://www.explorebeavertail.com/sneakboats.html[/qu That is it, couldn't remember the name, stealth.
I have a sit on type and love it. I'd think if you are duck hunting you want a sit on top to get in and out wearing hunting gear. This place might worth a trip to check out different kinds http://www.fluidfun.com