Do you have any pictures of your growing area, or of your plants once they started to have the wilt problems? They might give us more clues to help you.
My first thought when you said "trees have gotten over sized" was first, too much shade. You definitely can't expect tomatoes to grow well and ripen fruit without all day sun up there in Cape Cod.
Second, that the trees are sending roots under where your tomatoes are growing, robbing them of moisture and nutrients. A tree will generally send out roots beyond the reach of it's branches, so the size of the tree's canopy plus at least 5 feet for a large tree, you'll find tree roots especially if there is a water and nutrient source like a raised veggie bed. That would definitely cause your tomatoes to wilt.
Regardless of whether there is a disease problem, you should absolutely move your raised beds away from those trees.
Aside from the wilting, did the leaves of the plants look diseased? Brown, yellow, blotchy, or discolored? Were the stems of the plants brownish and discolored?
