I did the Rubicon several years ago with members of my old jeep club "The Seirra Ridge Riders" out of Sacremento. I did it in a Wrangler and most of it was not all that extreme. The tougher parts have alternate routes around them. I am not saying this to discourage anyone from making the trip, just saying with common sense you can take a Commander thru it.

By the Way, Lee and I are now up in Show Low sitting in a pine forest about 20 degrees cooler than Phoenix.