Anyone used 40' shipping containers as car storage??

[prostreetC-10]

In an effort to keep my truck, I've been looking into reasonable storage options. There is a facility that has tons of 40' shipping containers like you would see on a shipping boat. They are 8x8x40'. I could easily get 2 cars in there. Are they water tight? Does 8' wide even allow you to get out of the truck (I have small mirrors)? Leaking down the sides isn't a big deal as long as the roof itself doesn't leak. I live in a very dry climate so rust isn't really an issue but I don't want something that can sweat or hold in unnecessary moisture either.