I think BRRRR can still work really well under 2 conditions: 1) you have another substantial source of income and your capital is somewhat renewable (I don't) or 2) you're willing to compromise on your target areas and move to secondary, tertiary, or out of state markets (I am not) or 3)  you're very lucky and/or skilled at acquisitions (I am from time to time).  

All the replies above are based on ASSUMPTIONS about the condition of the plumbing.Is the plumbing able to handle the “standard” amount of toilet paper being flushed and the tenants are just “loading it up” before flushing thereby causing the problem?  

Since you're in FL, mobiles are prone to severe weather conditions which has happened time and time again in the past. 

Getting them to pony up even when they are at fault is impossible.2) This condition existed when you purchased.

You know you already have or can find a buyer for this very same property in it's very same condition for $150,000.

I would explain to them that for the unit in the condition it is in now that the rent is still below market rate. 2.

And, if you are buying a property that is already in good condition, or is fairly easily to rehab, you’re probably right.  

I lived in Toronto for a couple of years, and the real estate there is quite funky.Making the trip and meeting people in person will be worth its weight in gold...GREAT CALL on that.We work solely in Chicago as a general contractor...for now. 

(They paid a handyman $150 to put the weight back on the kitchen sink faucet line!

They are worth their weight in gold.They actually specialize in smaller multi family in the Lehigh Valley so their business is built around the model.