Bed Bugs ???

They can actually survive up to a year with no food. Then they just crawl into the next storage unit.

OR, there is this.....

Life Cycle

Female bed bugs lay from one to twelve eggs per day, and the eggs are deposited on rough surfaces or in crack and crevices. The eggs are coated with a sticky substance so they adhere to the substrate. Eggs hatch in 6 to 17 days, and nymphs can immediately begin to feed. They require a blood meal in order to molt. Bed bugs reach maturity after five molts. Developmental time (egg to adult) is affected by temperature and takes about 21 days at 86° F to 120 days at 65° F. The nymphal period is greatly prolonged when food is scarce. Nymphs and adults can live for several months without food. The adult's lifespan may encompass 12-18 months. Three or more generations can occur each year.

I've never had bed bugs either, but I make it a point NOT to get them.  We have never kept a mattress, comforter, pillow, pillow case, or any other large fabric item unless it was wrapped in plastic.  You can't sell them for a lot anyway, and I would much rather lose $50 than have bed bugs (or fleas, or ticks, or mites, or lice)  infect all of my other clothing & merchandise and have to spend time and money getting rid of them.

You never know why tenants got a storage unit in the first place-- you never know-- they may have rented a unit BECAUSE they had a flea or mite or lice problem in their home and needed a place to put their things while they cleaned their home.  I realize this is a stretch, but you never truly know, so you always have to assume to worst to protect yourself.

Rebecca
http://storageheroes.blogspot.com

fyi...i dont think bed bugs will just hang out in old mattresses etc... They are blood suckers so if there is no food(someones blood to suck) there they are going to move on.

Actually mattresses and furniture are the first place they hit, usually because humans occupy those areas, but also because it is dark and usually warmer there.  Trust me, I went through a Bedbug issue with the clients I work with about a year ago.

Oh ok yea I don't know much about bedbugs but it just seemed like logical sense that they would move around looking for food.