I am in Ga I personally do not do the trailer business,if you want to read a book on it look up Lonnie Scruggs he is the king of this stuff.
I do have friends that have been int he trailer rental business for over 40 years and have about 55 trailers they own and the land.While they do good,the margins get smaller and smaller every year.Some of the time you will have vacancies and if your lucky have them all fully rented out.Sometimes they trash them and move in the night or accidentally set them on fire,some renters are good people but alot are people who can't pass credit checks, have criminal backgrounds,and are transients that move from county to count and state to state.
Most of the good renters for 100 to 200 a month will stay in the nicer townhomes or a regular house than live in a trailer.
Local cities and counties want trailers gone,some of the main reasons is they bring in fly by night people that committ crimes and are hard to track down,the other reason is they are eyesores and it's hard to bring in new development when that is across the street.
The other biggie is property taxes,trailers aren't valued that much so they bring in not much revenue in taxes for the cities and counties.
For instance you have 10 acres and 50 trailers,each trailer is valued at 20k assessed at 10k so the property tax is 150 dollars,so you take 50 trailers and you get a tax base of about 7,500 a year.Now if you had 40 homes at 200k valuation apiece on the same 10 acres you would be looking at say 2,000k for each home for a yearly tax base revenue of 80,000k instead of 7,500 it is really simple to see why the counties and cities do not want them there.
Each year my friends get hit with more ordinances and expenses,it's the cities and counties legal way of saying sell to a developer to put in a nice development or we will make it harder on you each year.
I believe the trailers parks are becoming a thing of the past,in our county the require a purchase of at least 5 acres before you can out one residence on it now.