Moving and storage go together like peanut butter and jelly.  Rarely do you use one without the other.  Most people who are in a transitionary period in their lives tend to require both a place to keep their belongings, as well as people to move those belongings to their new, often temporary, home.  With that in mind, many facilities also rent trucks, as well as boxes and other supplies to make the process seamless.  Many even offer a truck with the movein to provide a convenient tool for new tenants.