Then replace the vapor barrier.Why cheaper then new drains.

High turnover, lengthy vacancy periods, and greater tenant damage will vaporize your hoped-for profit.

Site-built homes have numerous areas in which to place utilities, and they usually don’t close the only escape route for occupants, as happens many times in mobile homes.”In addition, pre-1976 mobile homes had less insulation in walls, ceilings and floors, uninsulated air ducts and no vapor barriers in their roof cavities, making them an increased risk of fire hazards.

No smoking, to include cigarettes, pipes, cigars, or any other tobacco smoking material, and/or vapor like products is allowed within the structure of the building; including the rental unit, basement, garage, or outside on the adjoining grounds, either by the Tenants or their guests.

Of note: this has not been evaluated by an attorney, and I have no way of knowing if the language would be legal in your state...NO SMOKING POLICY: No smoking, to include cigarettes, pipes, cigars, or any other tobacco smoking material, and/or vapor like products is allowed within the structure of the building; including the rental unit, basement, or garage, or outside on the adjoining grounds, either by the Tenants or their guests.

She sent me a nice excel sheet with her balances, mortgage payment, interest rate, and rents. 

The sellers have recently put new insulation and vapor barrier in this area of the basement (it would appear to mask the moisture problem?)

Then they will inspect framing, insulation/Vapor barrier , amp final inspection.

Only you can answer that question.If it is, then pay the tax and knock off getting the vapors over "paying taxes."

All the new information can give you vapor lock.