I do a little trapping around the house, damn squirrels hogging the bird seed. I've carry off probably ten each year.
Now and then I'll get a possum or skunk.
The mention of feral cats and the bloodbath due to releasing them got my attention. I've done this with skunks and it may come in handy for some. Living close to the lake with boat docks available I've taken skunks in the trap, covered with a cloth to a boat dock, I put a tether on the trap and lower the skunk or feral cat if you wish into the water. If you don't want to drown them leave them under for a minute or two and then open the trap under water.
If luck is with you they will swim opposite of your side of the dock and land.
Of course this a city boy talking, you country boy trappers may have better ideas.