I wouldn't use epoxy on it. Get a second black oxide screw.
Make a right angle sheet metal tab with a hole on each leg slightly smaller than the two screws.
Remove the truck and drill a hole in the bottom of the frame to attach to the bottom of the new tab to hold it in place.
Attach the body to the right angle of the tab that is sticking up with the other screw.
You won't even see the head of the small screw above the truck.
John