They are very easy to move with - not to mention afforable. Simply pack your stuff, set up a drop-off date, load the unit, and let them handle driving your stuff cross-country or whereever you are going.
Although they are not big, you can easily order more than one and get your stuff to where its going. Don't worry, you do not have to drive a thing.
Need a portable storage quote? Try Relocube by ABF UPack