That's terrible Mike! What a terrible experience to have on vacation. Honestly, there are some times we just can't help but leave some stuff in the car. I'm definitely going to recall your story and try to find a way not to though.
So did you lose the 6D or the 60D? Did you have insurance coverage? What lenses did they get? I'll definitely buy the insurance when I rent lenses now!
I'd love to do Antelope Canyon but don't think we'll be fully committed in time to get a spot. Probably just Canyonlands, Arches, and maybe Zion. Honestly, we haven't made specific plans yet. Probably a stop in Rocky Mountain National Park on the way out. I hope to rent a lens to take. But last time I wanted one they were out of the one I wanted so I passed.