The only two person hammocks I've seen are just bigger versions of regular hammocks, and you have to snuggle to stay in there.
I guess you could save the weight of one set of hammock supports if you made one like you're talking about, though. Could be a few ounces lighter. You gonna prototype one?
I usually just hang two hammocks side-by-side like Arkwater said. I hang mine quite a bit higher than my kids b/c I make it sag more (no funny comments here!) than they do. Then we end up pretty level when we're both ready for bed.
I try to use the same tree for the head end, and the foot end doesn't really matter as long as it's somewhere close. Last time it was close enough for my youngest to crawl into my hammock w/o touching the ground after I told him a scary story that was a little too scary. (He told me he wanted really scary...when I was done, he just laid there quietly for a second. Then said, "Dad, that was too scary. I'm coming in there with you.")
“Republics are created by the virtue, public spirit, and intelligence of the citizens. They fall when the wise are banished from the public councils because they dare to be honest, and the profligate are rewarded because they flatter the people, in order to betray them.” ~Judge Joseph Story
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IMPOSSIBLE JUST TAKES LONGER