We have used this place a couple times. Now dont laugh to hard but this really is the name. Its called the Adult Toy Storage and it is located about 20 minutes north of the convention center on I4. They actually have indoor parking for motorhomes that you can plug into as well. We used them a couple times between the Gainesville & Orlando points races. Here is their link.
http://www.adulttoystorage.com/
They treated us great and were reasonable on the price.
Good Luck.