So I've had some success. Just setting up at night and waiting for them to come eat works, but is difficult to distinguish possum, feral cat, fox, etc when real dark. Set out 2 live traps & check daily. 2/3 of the time it's possums, but getting some raccoons that way also. Between the 2, that has gotten the raccoons down from 6-8+ at a time to maybe 1 a night coming by. I haven't killed that many, but have apparently at least scared them off, maybe just temporarily.
What is interesting is what i've learned about possums. I had no idea those things were so docile. A trapped one could care less that the trap is opened or i'm there messing with it. They'll stand up, walk a circle or two, then lay right back down - just like a dog does. Eventually after dark they wander off, but could care less about just sleeping in trap all day even though door is propped open. Will take food out of my hand, will drink if i put a little container of water in the cage, but will not get up and leave
So they're annoying, setting off traps that might otherwise nab a raccoon, but I don't think they're hurting anything. Probably also serve as coyote bait? No idea, but having possums frequent might help attract the coyote that's left to dispatch as well. I only see her on camera about once a week or so and NEVER when i'm set up to hunt. But I thought the coyotes were dealt with, but still seeing one occasionally on camera.