Moth balls have worked well for me in getting rid of skunks & other unwanted animals; I bet they'd work for possums, too. (And they're cheap!) Sprinkle a few on the ground around the plants; replace them after rain or really heavy dew.
It would be unfair and cruel to take them into another area as they are extremely territorial. Any program I have seen where they rescue possums they always return them to the place they found them. As for deterring them from your fruit - I'm not sure how that would be achieved.
For those who say cats and opossums don't bother any one or anything, they are wrong. Just saw a opossum kill my new baby kitty right in front of me. Couldn't get to it fast enough. My heart hurts and opossums suck.