4 Season or Extreme Winter Hammocking?
Just to be a little picky here, but isn't the real question, "Can you use a hammock in extreme winter conditions?" Nobody has made any mention about the other three seasons.
Are we talking about one set of gear that has the inherent flexibility to be used all year around? A single standard pack load. Or are we talking about a gear locker at home from which you can pick and choose what's needed for a particular trip? And what does that investment look like? How many hammocks? How many quilts? How many Tarps? etc.
Just thought I'd stir the pot a little.
Regards,