Miller's storage barns had its humble beginnings in 1979 as a one man owner-operator business, offering a limited selection of quality storage barns.. Miller's storage barns, llc is an ohio domestic limited-liability company filed on march 3, 2014 . the company's filing status is listed as active and its file number. At miller's mini barns, we care about making your dreams come true. we offer a full line of quality-built portable sheds and cabins, storage sheds and cabins..