The tradegy in Indiana has me re-thinking my decision process when selecting trees to hang from.
I am familiar with the postings that relate the angle between the suspension and the tree to the loads on the tree. I have also read postings that discuss having too much tension in the suspension. I am familar with looking for widow-makers since that rule applied to tents as well. I have done some "back of a napkin" math that led me to the conclusion that a 6" diameter is a good rule of thumb for a healthy tree so that it won't bend too much from my weight.
What I have never done is assess the health of the trees beyond a general inspection of "well, it has leaves and doesn't appear to be rotting away".
What else should I be looking for? How do I decide a tree has a "good" root system?