Standard feeder should do the trick.
I personally like to put feeder higher so it casts the corn/feed over a wider area but have to carry a 6' step ladder or stand on my Mules bed to fill it.
When feed is spread out wider, they have to look for it more and stay in area longer.
It also keeps fights to a minimum as they can spread out and eat instead of being in a small area.
Basically any 55 gallon barrel type feeder should do the trick and holds a couple of weeks worth of corn.
Add a solar panel to keep feeder battery charged.
If you have coons and/or squirrels, get a steel barrel and put a cage around feeder unit and protect the wires from solar panel to box.
If you have ANY pigs, cows or goats/sheep in area, be sure to stake the legs as they will rub on them and spread them out.
A simple sun sensor controller will adjust with the seasons and feed morning and evening.
A digital feeder controller can be set to feed when you want.
I've had good luck with this box using both sun sensor and digital controllers.
It's big enough to hold the bigger 6v-7ah batteries that last well during a week of no sun on solar panel.
It is very adjustable and fits on a lot of different containers from 5 gallon bucket to 55 gallon drums to large home made feeders.
The case is sheet metal so it stands up to squirrel and coon abuse well.