Well, I actually rented the unit this time since there was a lot of heavy furniture and I didn't want to move it. I just took photos of the furniture and placed ads on Craigslist. After I sold all of the furniture and removed everything valuable, I placed the final ad on Craigslist under the garage sale section. The ad went like this:
Over 100 items in bulk
If you're a reseller looking for merchandise, I have a deal for you. I have a storage unit with lots of clothing, toys, housewares and decorations for sale in bulk. You could easily resell these items for $400-500. Contact me if interested.
I placed this ad on a Monday morning around 10:00AM. By 10:30 I had two people who wanted to come look at the unit so I took the ad down. The second caller was told that there was someone else coming to look at the merchandise and if she didn't buy it, I would contact her so she could come see it. (I like having a back up) The first lady and her husband bought the unit and cleaned it out for me.
Sometimes it's worth renting the unit just so you don't have to move anything.