Remote Areas Border Security Enhancements Act This bill prohibits the Department of Homeland Security (DHS) from beginning construction on any infrastructure project along the U.S.-Mexico border until (1) the Government Accountability Office evaluates the need and costs for using certain enhanced technology and other resources in rural and remote areas along the border; and (2) U.S. Customs and Border Protection acquires or increases the use of such enhanced technologies and resources, including advanced detection surveillance technology, night vision technology, and off-road vehicles. DHS shall establish the Agent Mobility Program as a five-year pilot program, which shall provide certain benefits to agents who serve at least three years in a hard-to-fill station in the El Paso Sector.