How hammock camping actually works, why insulation is the part everyone gets wrong, the three Kammok hammock tents worth knowing, and where in the country the trees cooperate.
Colder, unless you insulate underneath. A tent floor plus a sleeping pad traps still air below you. A hammock has moving air below you and your body flattens the bag insulation on that side. With an underquilt or a pad in the hammock, it is comparable. Without one, expect to be cold roughly 20 degrees above your bag rating.
Overnight, no, not comfortably, even in models rated for the combined weight. Two hammocks are usually lighter than one two-person tent anyway. If you want to share a shelter, a convertible like the Sunda 2.0 pitched on the ground is the practical answer.
Very little, if the fly is pitched. A hammock with a proper rainfly stays drier than most tents because there is no floor collecting groundwater and nothing to flood. Add drip lines on the suspension, which are short pieces of cord tied under each strap so water drops off before reaching the hammock.
Roughly 12 to 18 feet for most hammocks, and at least six inches in diameter, live and healthy. Wider spacing works with longer straps. Narrower spacing forces a tight hang, which sleeps badly.
It depends on the park and often on the specific campground. Some allow it with wide straps, some restrict it to designated sites, and some prohibit tree suspension outright to protect bark. National forests are generally more permissive for dispersed camping. Always check the current rule for the specific unit before you count on hanging.
You need bottom insulation of some kind. An underquilt hung outside the hammock is more comfortable and does not slide around. A closed-cell or wide inflatable pad inside the hammock is cheaper and doubles as ground insulation if you end up sleeping on the dirt.
