Secret #3:
Will you need to access your storage space frequently?
Answer this question first and it will help you rent the unit size that is not too small and not too big, either saving you much frustration or a good deal of money.
If you plan to access your unit frequently, rent a unit ONE SIZE LARGER than the Site Manager recommends. By doing this, you'll have some "elbow room" to make narrow hallways in and around your boxes and furniture. This way, you'll be able to reach the back, the middle and the sides of your unit with ease. (Your blood pressure probably dropped a few points just thinking about it!)
If you plan to "store and run" and won't be needing access often, select the unit size recommended, or even one size smaller. With proper box stacking and item arrangement (standing a sofa on end, for example), leaving no extra room as you pack and stack, you'll be able to save money month after month by renting a smaller unit size.
WARNING: We must offer this word of warning. Experience has proven that if you do rent a smaller unit and find that you need to retrieve something quickly, "Murphy's Law" dictates that the item you seek will be located in the back and bottom of the storage unit. Plan your packing carefully to save frustration later!!!