http://feralhogs.tamu.edu/trap.cfmIt has alot of other stuff about trapping hogs but it shows the best pics of a saloon door. Now what about this Iron Curtain RL you got my curiosity up!!!
I like the saloon door cuz they open from the side and does not rub on the pigs back, which makes it more continuous trapping IMHO. It also has less moving parts and the springs to close the doors don't have to be huge.