Hope someone can help me with this.

I am planning on setting up in my backyard permanent posts (anchors) for my BMBH deluxe hammock. So, what is the ideal distance and elevation, (eyebolt to eyebolt) for this hammock? I will be using 10ft 6x6 pressure treated timbers. I assume I need to sink the posts in about 4 feet which should give me a 6ft elevation for the posts.

Stu