Cool rig, father and son team Elmo and Charlie Pacheco, also known as “Team Cutters,” brought “Endee” a 1942 International cab with a custom 36-by-78-inch sleeper and a 6BTA Cummins

those are flagstones along the middle from front to back

Overdrive did an article on it http://www.overdriveonline.com/new-mexico-1942-international-rat-traps-the-big-one-in-vegas/