B.I.G. Enterprises, Inc., of South El Monte, California, designed and built checkpoint booths reminiscent of Airstream travel trailers for Elephant Butte State Park. The modular units include rounded-end, glazed windows that aid visibility and complement the look. A larger version includes a rest room and an office area. The booths were prefabricated and ready to install on delivery. The company engineers and manufactures a variety of booths for the protection of guards, cashiers, and others.