Stick the laptop in a suitcase, make sure all sensitive data is backed up someplace else. Chances of it disappearing are pretty slim. And it won't be due to the bears. (I can certainly understand the need to keep in touch. I carried mine on our honeymoon to New Zealand

I actually got some work done while sitting in airplanes and airports.)
Just make sure NO food/snacks or scented things like tooth paste, deoderant or other personal items are in any of the baggage! No ice chests -- even empty (could have a food odor).
If you are going in more than one car, leave one with all the smelly stuff in Lone Pine.