I grew peanuts for about 20 years from the middle 70's to the middle 90's. We are on the northern edge of the GA peanut belt.
Lilliston and Long were the two major brands of combines used in our area. I bet you could drive through South Georgia and find combines and diggers (KMC) stored under barns and shelters that could be made to work for little time and money investment.
Most of the tractors used to pull combines and digger/inverters here were in the 75-100 hp range. I once gathered 70+ acres with an old Benthall brand picker that was practically given to me. I missed one day of combining with a bad bearing. I pulled the old picker with a 235 and a 175 MF.
Most of the time we hired neighbor farmers to harvest our peanuts. Most years we only grew about 25-40 acres, and we didn't feel the investment for good equipment was feasible.
In addition to harvest equipment, drying wagons and dryers are a concern. In our area few farmers had their own wagons and dryers, but in South Georgia most larger farmers dried their peanuts on the farm. We just rented wagons from the local peanut handler, and they dried them at their place.
Peanuts are a fun crop to grow, but also a very expensive crop. I wish I could still be a "peanut grower".