I wanted to see Roswell.... and we almost skipped Carlsbad Caverns. Instead we skipped Roswell and got tickets for the 1-1/2 hour tour through Kings Palace in Carlsbad. Out of a six month trip... I'd put Carlsbad Caverns as one of the top three places. Make reservations for the tour.
There's an Escapees campground between Roswell and Carlsbad. We almost skipped that and opted to stay over closer to the caverns. Instead we changed our mind and stayed at the SKP's cg. Loved it. Loved the people. Felt like we'd come home to someplace we'd never been before. Stayed two nights.
On the 2nd night I commented how nice it was that everyone put lights under their rigs... to make it easier to see at night. But I was told that it's to keep the pack rats from getting into the wiring and doing serious damage at night. I'd never heard of such a thing. (So Pack some rope lights along. They can be strung up in the awning or laid down on the ground either under the rig or around it...even as a walkway.
Don't make an iron clad itinerary with a time table that will wear you out. AND keep an eye out for weather. Sometimes you can hold up or speed up to keep a storm front from getting a direct hit.
This is the weather / trip planner that should help you a bit.
Weather Underground http://www.wunderground.com/roadtrip/
As far as surviving the trip...
Don't get in a huff or a hurry.
Be sure to tell your wife how beautiful she is and
Thank the Lord for her every now and then.... out loud while holding her hand.