Also, if there are bonus storage areas like a garage, I’ll try to rent these out separately. 

Left a bunch of junk, garbage, old furniture, stuff in his storage space, etc.

If you use regular corrugated sheets, the house will look like a big storage shed IMO.That being said, I can't believe it would reduce the value of your home.

* Turn key parks don't often give us much to work with and it's hard to get the math to work to pay investors back* If we can't create value by the 3 above, is there another obvious growth area (mini storage?)?

In my case, I have residential rentals in one LLC, commercial properties in another, self storage in a third, and my real estate company operates in a fourth.

Failure to do so could result in a $100 fee.If Tenant fails to property maintain smoke detectors, Tenant will be assessed a fine of $50.00 per visit with non-working detectors, after the second warning.Unauthorized parking, storage, or accumulation of waste may be assessed up to $10.00 per day per violation.Failure to set up water/sewer/garbage or electricity accounts promptly may result in a $35 charge (each).Any rent due not paid by the 4th day of the monthly rental period is subject to a $30.00 late fee charge with an additional $5.00 for each additional day that the rent remains unpaid.

Storage facility?

Hey Dario, that is great news, Another option to think about is the single wide on a quarter of an acre might be fencing off some part and renting that out as storage.

We are looking to add a self storage to our holdings at some point as well. 

My area we have huge demand for them, and they are easy to rent out say 2sqft to guy looking for storage or a small contractor.