I just got off the phone with a friend here in Las Cruces who was on his way back into town from Silver City. No positive news unfortunately.
~54 search volunteers checked into Incident Base today near the Gila Cliff Dwellings/TJ Corral trailheads, at the location of his vehicle. This has now become a multi team search party, consisting of organized SAR teams, horse teams, friends, fellow ultra runners, and local authorities. Two helicopters and a single fixed wing plane are also providing search coverage.
There were several eyewitnesses who saw him driving up NM 15 towards the Cliff Dwellings for what was supposed to be a short run. Caballo's dog was found in his vehicle at the trailhead, so this run wasn't to be an epic.