Regarding mobile home investing, one main important factor is to first do market research and get to know the supply and demand in your area.

The x factor is the MSA population has increased by 15% since 2007 also .  

Construction time on site is reduced greatly but you still need about the same amount of time to build the unit, it just happens in a factory. 

It's really important to run your business with an ironclad lease, rules and standards however... the human factor is also something you should take into consideration as well as compassion and just plain 'doing the right thing' regardless of what is written in the lease - in the end you want to make your money, the right way without causing others hardships if you can and be seen as a respectful landlord/investor which helps the community. 

The appreciate factor is more possible with this one than most since its well built. 

Although interchangeable terminology they are entirely different.Mobile homes have extremely high maintenance costs due primarily to their construction and age.Manufactured homes, built in a factory assembled on site, are better built than stick built homes. 

The factories still support hundreds of jobs. 

Another factor is that I don't think there is any more than about five years on the roof.

William Brown A risk factor is that the condo board/association decides to disallow short-term rentals.

Josh Engelhart While you are missing expenses (as noted by others) the single biggest factor is occupancy.