I am with the Town of Edgewood, New Mexico and we have a facility that is just off I-40 that is available for our equestrian friends to stay overnight at no cost.
It is located at Exit 187 on the North Frontage Road adjacent (just West) to Wildlife West Nature Park and Rescued Wildlife Zoo. http://www.wildlifewest.org/
It has potable water, an arena, lots of parking for big rigs, about 1 1/2 miles from a Super Walmart and a mile from a Smith's grocery store. No RV hookups.
Easy off and on the I-40 freeway.
Parks and Recreation
Town of Edgewood