Conex / shipping container for mini storage ?

[Steven Westlake]

Has anyone ever used conex / shipping containers as mini storage? I was driving by a lake resort area and seen this being done. If a 20 x 8.5 unit delivered is $3000 and it rents for $90 per month that is 3%, at a time when 1% is hard to find. I have some land behind one of our triplexes. Which would probably hold 10 units. So 30k for 900 income, perfect numbers for syndication, and built in under a week.

Plus they could be moved later.

Please, Shoot this down if you can, what did i miss?