I was playing around excited last night about my tarp shipping... Anyways I noticed that my small shock cord looked like it would fit in my mini line locks... A little wiggling to get it through the holes but they fit just right and squeeze down crazy tight because of how squishy they are... So I found my door set up... 3-4' of shock cord, line locks on the tarp door and a mitten hook tied on the end...

I can't see any situation that that wouldn't cover, I have adjustability from inside the tarp, an easy way to adjust length, a little wrap around a stake if I want to go with doors down on the side in porch mode... And its all shock cord so less of a trip hazard... Seems like this solution covers all the bases...