The problem is the buildings are in major need of repair...and because of this, rents are one of the lowest in town. 

Budget better for Repairs and Vacancy!

Foundation repair salespeople are great sources to find deals.

We purchased it for 135k and we put into it about 15k in repairs, of which most of the work we did ourselves.

Maintenance can also be a factor—while newer homes may require minimal upkeep, older units might need more frequent repairs, particularly for things like plumbing or HVAC systems.Some things to pay close attention to:Zoning and Permits: Check local zoning laws and permit requirements to ensure you’re allowed to place a mobile home on your land and rent it out.

A 100-year-old home with structural concerns could mean costly repairs, so get a thorough inspection, especially for foundation and floor issues.

Simply put that money in your pocket and save it up for repairs. 

What is the service life on this piece of equipment.If it has capacitors the service life could be 10 years, or they may have a service life of more than that, but they don't live forever (what about repairs?).

If they are not good at property and asset management your "investment" could become a money pit with vacancy and repair expenses. 

Most things in relation to the rental are deductible - Mortgage Interest, Taxes, Insurance, Repairs, etcIf you are unsure of what is deductible, you may want to consider working with an accountant.