Since you say you have a lot of experience hiking, I am going to assume you want a partner primarily as a climbing spotter or belayer in which case, as others have said, this is absolutely the last place you should be looking. A climbing partner must be someone you feel safe entrusting with your life and limb, and is not someone you find on a whim. Also, climbing in the Superstitions is very dangerous because of the type of geology contained in these mountains: very brittle, always crumbling and breaking without notice or warning.
Also, am I right in assuming this is your first trip to the Supers? In which case, I would advise you to just start off with some simple hikes instead of something that requires "hardcore endurance." I have hiked many, many times in the Supers over the years and not once did I have to invoke some sort of "hardcore endurance" to explore the mountains, other than the discipline to stop and turn back when I started to run out of daylight.
One last thing: there are not that many trees in the Supers, never mind one that bends right over, so you will have to use something else such as an actual climbing rope to lower yourself somewhere.
