Hammock Forums is a good source of information on hammock use, but with trees. You may find information on use as requested by the OP, but you'll likely find it far and few between.

I am playing with the setup in the picture above for my Sierra-Cascades trip, as suggested, you can stealth capm easier using a hammock. On a related note though, I feel a little uncomfortable putting my hammock in trees at state parks, as I think I'm going to be told I cannot touch the trees. Of course these poor trees are whacked at by people with all sorts of sharp instruments and my hammock straps do no damage. Tents are simply accepted.

As far as under insulation, I use the same pad for the hammock as I use for the ground. I don't think an underquilt is necessary until the temps drop very low, but I still think (no experience though) that my insulated sleeping pad would work okay.