Boat and RV storage is at a premium for many people so you have a good idea to use existing land to generate income without doing too much in the way of improvements.Renting it out for RV storage is a great idea.

I actually think I could get closer to $1,500/mo for this one  because it's so nicely finished, and also has 2 additional finished rooms that could be office and storage space/dressing room. 

Looking ahead and being aware of opportunities vs behind/above waiting for another shoe to drop. 

Put the shoe on the other foot. 

I know they can be very difficult to manage, and many of them are old.Self storage and industrial are two niches that I think you should also consider.

For example, if you have a garage, basement, or storage area that’s not in use, rent it out separately to a tenant or even a non-tenant for additional income. 

Do the closets have nice organization storage?

@Chris SeveneyWe are in self storage.  

I now have three tenants and I lease part of one of the properties back to my business as a storage yard (so 4 streams of income).

@Jordan RegierA garage is definitely a benefit for storage, recreation area, etc.