I have 3 tree straps. 2-7'6" and 1-15'. The tree size here in Cali can very depending on the eco system. Also they have a tendency to be far apart in some areas. that's why I have 15' whoopies.
"Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books."