my 2 bobs worth
have springs on all ropes,,i find i have very little trouble with pegs getting pulled when the wind blows,or the ropes shrink from getting wet.Also much easier to get equal tension on all ropes
I also loop the rope around the pole before putting it on the top of the pole.. this stops the wind lifting the tarp off the pole.
I use a silver/green tarp.Light and easy to put up..doesn't take up a lot of room in ute.
Jim