Gosh, but absolutely no real idea. I've heard of people putting up a hammock for sleeping or just a cargo net for storage, but this doesn't look right for either of these. It's a bit like in inside roof rack!
Only other thing to suggest is to see how much it expands / collapses or see if there are any logos / numbers on the parts that you might be able to look up.
Sorry I can't help more, but do report back when you have found out.