My wonderful wife got me a sewing machine for my birthday a few yrs back. I make the tree straps in different lengths depending on where I'm going. I've also made a tarp and a bunch of hammocks.
Now I try to have short woopies and long straps. Double wrapping the tree just gets more sap on the strap, so in Colorado and the mountain west i find about 8' usually works well. Last yr I started taking a pole for one end. Now I only need one tree and distance isn't an issue since I put the pole where I want it. I can also orient it wherever I want based on the wind.

Sent from my couch