So you end up paying a premium for corrugated metal sheeting as your exterior material but with the catch that you have confined yourself to set dimensions of the container. 

I have heard of cozy and tellus, and other recommendations?

@Pedro Sanchez I would look into Cozy.

Rent collection you can collect on line many resources like COZY, ClearNow, etc.  

I use cozy as well.

I use cozy for credit/background check.

Investment Info:

Single-family residence buy & hold investment in Houston.

Purchase price: $162,000

Cash invested: $50,000

3 bedroom/2.5 bathroom single family home used for rental property.

...

Craigslist sucks...... full of scammers, dead beats and tire kickers......Recently had my ad on another site pirated and placed on Craigslist by a scammer trying to rent my place out as his own.....Much better results with Facebook, Zillow, Truilia, Cozy, Hotpads etc.....

I also have 95% of my tenants paying with Cozy.  

For my first rental property I used cozy.