If not, then hook up with a reputable wholesaler and tell them you're looking for a deal and you want to see their assignment agreement before you buy any deals with them.

A reputable builder would have got the leak fixed before it got to the mold stage and before they put in the finishes. 

This is just like manufacturing. 

A reputable and honest construction company would not charge you for an estimate.  

Hands down the 3 niches are:  - manufactured home communities- self storage- multi family apartmentsThis blog summarizes the reasons why:https://www.biggerpockets.com/member-blogs/9145/74876-growth-with-downside-protection-3-all-weather-niches-to-invest-in

Why would a realtor risk their reputation having two offers accepted and then telling one owner, sorry he changed his mind (which is not a valid reason to break a contract)?  

Many areas are not allowing new mobile homes to be placed on lots- they're trying to basically get rid of mobile/manufactured homes. 

Small, seemingly inconsequential but unplanned purchases can add up to big money.Do your research, and choose reputable, knowledgable contractors.

I did a lot of Googling and I can't even come up with a manufacturer for that thing. 

A few more DD areas, does the board have a lot of turnover, any prior or current litigation, and reputation of the management company.