This is the best way to eliminate gut or emotional decision making.

Also, come resale time, the duplex would have a proven track record of producing income and has definable value, whereas a single family home is largely dependent on current market conditions and home buyer emotions and buyer pool at that given time

Document everything sticking to the basic facts, try to leave emotion out of it.

I'd double check that it is a service dog vs an emotional support animal (pet with papers someone paid for online).What is the rationale for charging more rent? 

Emotional support animals (ie pets with paperwork) can be anything and are not trained at all. 

Effective communication, emotional intelligence.

Just gotta do the math... but you also should include the lost space rent cost while rehabing and the mental/emotional torture going through the process of rehabing a mobile home. 

It just means I mind my business, and have my attention, emotions, and focus on things I can control. 

Both emotional and factual/analytical support.

Interacting with tenants took a lot of my emotion energy and I was not the worlds best screener.As far as repairs go, you’ll  have those whether you self manage or whether you are use a PM so that’s beside the point.