I suspect bobcats and python would take care of the oppossom! :)
Lord I hope not. We had a coyote couple on the island and people freaked out. Lot's of cats disappeared. The male was in my yard one day and hopped a 6 foot fence like it was nothing. Opossums prey on the rats. They can have a few tomatoes and passion fruit. But that sumbeech that stole my watermelon is on my list.