Welcome to Mt. Juliet, you'll love it here. as for your question ,The only covered storage that I know of is in Old Hickory, the website is www.vanguardstorage.net
,its about 10or 11 miles I guess. We have a new storage place that just opened in providence,they are going after rv business.They have real nice parking spots and thhey ara talking about haveing elect. provided. I don't think they have any covered spaces yet.
Give them a call ,providence self storage 615-758-5700 or 1-800-770-7889.
Hope this helps