but if folks down south would kill and sell these animals, first, is it legal? second, how much would they go for? I wonder how large they get... but I'd love to try and get one.
In general it is not legal to sell them. There might be some very special exceptions though. Meat processors need a special permit to process wild game for the hunter/trapper's consumption. We had so many we usually didn't dress them out ourselves. We took them by the truckload to a professional processor. I don't know what they might sell for if that were an option. We gave away all we couldn't eat.
Some get huge if they avoid traps long enough. I caught some that were in the 400 pound range. Maybe more. Huge. Mostly they were in the 50-200 lb range because we set traps constantly to try to keep the population down. They breed young & fast so it's almost an impossible task.