 Iron Horse RV & Trailers Mobile Service, 208-228-9121. Locations in Rexburg, Berk in Utah, and now on the Louisville Highway, Idaho Falls. KID News Radio Studio, powered by Iron Horse RV & Trailers in Rexburg. Off exit 322, Highway 20, Rexburg. When a journey matters. Iron Horse RV. Online 24-7 at ironhorservyandtrailers.com.