I'm from Monahans, about 50 miles (just down the road in TX!). Saw these rigs on my last trip to visit relatives in Oct. Used to work derricks for Loffland Bros., Parker, Sharp, Helmrich/Payne, you name it all over the Permian basin, east TX. Can't tell if these are Lee C. Moore derricks, or not but they ARE called jackknife rigs. We used to draw a card to see who would have to go outside the upper dog house to pick up the string to make a connection.....ice would accumulate and rain down on ya! We had tin/wood put up as a barrier but it didn't always work. The coldest I ever recall was somewhere outside Lubbock in January 1970. Can't recall the temp, but my tea froze up in the thermos in my locker (WITH the diesel heater goin full blast). As I recall, "ain't nuttin' 'tween Lubbock TX 'cept a 3-strand bobwire fence.....and one string is broke".! Mac Davis' song "Happiness is Lubbock TX in your rear view mirror" ain't far from total truth.