Storage Units?! Really?
You have so much crap that it won't fit in your house and you have to pay to have it stored? (I'm not talking about people in the process of moving and between homes, or those in the Mob who need places to stash bodies, guns and drugs. Storage units are great for those needs.)
Paying $100-$400 a month (the going rate around here for a storage unit depending on the size) to store your material excess is insane. Sell the junk on eBay, at a garage sale, on Craigslist. Donate it to Goodwill or some other group. Throw it in a freaking landfill. Just quit paying all that money to store your grandmother's "antique" furniture she left behind. It was cheap then and it is junk now. Your grandmother wasn't a Rockefeller, she was a tightwad. She is rolling over in her grave and cursing your name that you are paying a small fortune each month to house her Montgomery Ward catalog furniture. Just let it go.
Are you really gonna use that Bowflex or thigh-master 2000? Will you ever fit into your clothes from college and are they even in style anymore? Your bobblehead collection of the characters of Joanie Loves Chachi? Get rid of them.
On the other-hand owning and renting them might be a good way to make a buck. So many people have so much stuff. It's probably a good business to invest in.
We have a ton of junk too, but it's all in our attic, closets, garage, shed, and every room in our house. But that's an issue for a separate post on detachment.