I don't see a framing plan but the span is tiny - 2x4s will carry 10# of dead load and 20# of snow load (about 14" of snow) over that span with less than 1/360 deflection, when spaced 2' oc.
So I'm not worried much about loads unless this thing is built with toothpicks.
That said, a tarp won't take those loads, or if it does, it won't for long. Expect it to tear where it transitions from supported to unsupported.
The frame seems to be made from electrical conduit.