It's plenty big enough, but it has grommets. That's a no-no, especially if they are metal. Grommets rip out too easily. But... it would work and probably last you a while. And maybe by the time they rip out you'll have learned to sew or know someone who does. It shouldn't be too much of a project to fix any grommet tear outs with reinforcing patch and webbing tie outs.
Of course, it would be easier to just get a better tarp.
There are a few folks on here who have one of those Equinox sil tarps, hopefully they can chime in and say my grommet concerns are way off base and they have held up fine to gale force winds.