It might be more difficult to take advantage of these zoning exceptions with a pre-fab container structure.  

I personally find sec 8 a difficult program to incorporate within what I want to do as a landlord and am not interested in the program, you can either choose to or not to.. you can search many posts here on BP about sec 8 .

The farther you are from the norm, the more difficult the sale.In my market, at the price range of 3-4 mil there have been 84 sales in the last year... out of 939 listings taken.

LLCs aren't particularly difficult.

The last step seems to be the most difficult for so many people.

I am looking at purchasing a complex with 6 of them in it, but I am concerned that they maybe difficult to keep rented do to the market.

Typically speaking, you will have a difficult time finding "turn key" properties that make a lot of sense from an investment standpoint in this market and will find that the properties with the greatest potential for investment, yes even buy & hold, are those that you can add value to in a way that the typical "retail" buyer can not (or is likely unwilling to).  

Jesse, In our experience homes already in a state of foreclosure are difficult to wholesale.

Well its probably zoned for duplex, so it could be difficult to get it rezoned for four units (multi-family).

Also, I would avoid any houses in flood plains and it would be difficult to obtain insurance from what I have heard.