If I recall correctly, you want 10% of the overall trailer weight as tongue weight - too little, and it fishtails (a scary time when I was helping a friend move!), but too much (within reason) doesn't really seem to be a problem. My boat trailer probably has 20% tongue weight - other than being a PITA to put it on the truck, there have not been any problems.
For your deer stand, how about building a rack for the roof, and sit up there! You know, like the buses folks take to the races!