On a recent morning, a few volunteers are loading donated goods onto a truck waiting at the Catholic Charities Food Bank in Monticello.The truck will deliver the donations to thrift stores in Caribou and Presque Isle, and on the trip back, it’ll bring peppers, apples and tomatoes. “The apples came from a friend of ours who’s a farmer,” said Dixie Shaw, the director of hunger and relief services for Catholic Charities Maine. “The peppers and tomatoes came off of trucks.” Trucks that have unwanted produce know to call Shaw, who’s been orchestrating the criss-crossing of food and donations across northern Maine for more than 30 years.