http://chambana.craigslist.org/grd/5788922884.html
What would a duck hunter do with it?
1) Convert it into an amphibious vehicle?

2) Catamaran air boat?

3) Portable field blind?
I like #3 the best. There's a certain field where they pile the round bales into a corner. Can see that "trailer?" tucked into them hay bales with a nice heated blind. The only problem I can see is keeping all the other hunters out of it. The location I picked is sort of a funnel for the Canada Geese and they fly thru "the funnel" twice a day.