In addition, the water main line is rusted and would need replacing.

Unless they're on a foundation, container buildings will be considered by banks as "personal property," and banks won't finance the main house if there's a "trailer" on the property when the next buyer takes possession.  

It seems The main objectives to focus on are learning pricing a job correctly.

Or maybe it'll add slight value since it'll allow for a great parking situation for the main property/units instead of being street parking (on a relatively busy street).They're asking $39,900 for it.

Currently living in Maine the only places that show good cash flow from my perspective are the two worst cities in my area.

What's the main limiting factor for comps?

I understand people are concerned about property taxes but really isn't the main question and concern focus on ROI?  

I don't know what MLS she uses, but I mainly use the NJMLS and it doesn't allow me to search by what type of financing the buyer used.

My main interest is real-estate investing.

To be more successful, you simply have to work on the other elements to progress your REI pursuit.