"it's more expensive" - so is buying a bad deal thousands of miles away.

If you treat them like a commodity and someone who is stealing from you, why on earth would they bring you any opportunities?

Downside is bad tenants, depreciating trailer if you don’t own the land, and restrictions if the park if the owned by someone else.

Bad from  return standpoint, but good from a retirement view.4.  

One location is bad they have others to average out.  

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

PM has bad reviews for the most part Am I crazy here? 

While it's not AS bad as markets like Austin, TX, Florida real estate is near the bottom of my list in terms of return potential for the next 1-2 years. 

I cannot claim as of now whether they are good tenants or bad. 

They also said they see this problem ALL the time in Philly… when the city or a private individual knocks down a rowhome, they are responsible for treating the exposed partition wall of the next door property to protect it from the elements.