The heat of the summer? i've only had a chance to use my hammock in cold weather so far. as the sun is taunting me with the thought of summer right now, my question is this: is any under insulation necessary in the summer? can i, like i'm hoping, totally eliminate all pads and underquilts in the warm season and carry only a summer weight bag? should an unexpectedly cold night pop up, will a vbl (tarp, space blanket, poncho, etc) get me through comfortably in a pinch?