"A frame" (above)
Mosquitoes in Northern Yosemite July 2010 (above video)
Here is the tarp I used on the PCT and the TRT. It's the Spinn Twinn by Gossamer Gear. It's an excellent tarp in my opinion, large enough to provide plenty of space, simple, and light. I've used it in heavy rain in Oregon and Washington and stayed plenty dry. Of course, you must be smart about your decisions when it is raining to stay dry.
I usually set up the "Stingray," mostly out of laziness. Usually I'd be so dog tired at the end of the day, I had little energy left to do anything. Same proved to be true on the TRT. I've always felt the "A frame" to be the most "bomb proof." On the PCT, if I knew heavy rains were coming, I set up the A frame, and enjoyed its protection from the elements.
On the first couple of days on the TRT, I was worried. Mosquitoes were out and I did not know the extent of their ferociousness. I was doubting my shelter choice because I did not have bug netting. I did not, and was horrified of the thought of experiencing mosquitoes like I did on the PCT in Northern Yosemite in late July last year. They did not bed down in the evening and attacked all night long in swarms. Thankfully, on the TRT, the mosquitoes disappeared after the sun went down, and the couple of nights they didn't, they attacked in small numbers which made it bearable. If I am able to hike a long trail again, I will consider sewing a mosquito net onto my tarp.