As long as the treadle door is spring loaded it will stop rats. It needs to be at least three to four pounds of pressure and you are correct that most treadle feeders are not spring loaded they won't stop rats.
The hanging bucket or feeder won't work with rats, they just learn to jump up and hit the toggle. Sparrows have been known to do the same. Might buy some time but they will figure it out.
The hanging bucket or feeder won't work with rats, they just learn to jump up and hit the toggle. Sparrows have been known to do the same. Might buy some time but they will figure it out.