OK, they’re hanging by more than a horsehair… a couple of toenails through the top chord- that 2x4 horizontal ledger carried no weight, top chords were cut too short to bear on it and anyway, these trusses were not designed to hang from the top chord but to bear on the end of the bottom chord, either in a hanger or bearing directly on a wall- and a few deck screws in hangers at the bottom chord. 2x4 hangers. Deck screws. Built in 1975. The garage roof four doors down in the same complex collapsed last winter.
Trusses in the left side of the first picture had no hangers at all and were bearing on the offset wall, four feet back from the end of the truss.Trusses are designed not to bear on interior walls and bottom chords should bear no weight except at design points, typically at the truss ends.