If you are going to focus on that find an area that is closer to public transport going to other feeder cities and check out the crime stats on any neighborhoods.

I'm looking to purchase a newly renovated 2 family home in Jersey City Heights less than a block from public transportation into the city.

They actually have some 'better' features in that they have to survive being transported to the job site, so framing tends to be larger and in some areas doubled up to keep it ridge during transport. 

Tenant quality will depend on the neighborhood, proximity to transportation, highways, schools, food, shopping, etc, and quality of rehab workmanship.

Mildford and Hamden are very quiet places and limited to transportation ( you must have a car!)

I could agree with that, though it would be hard to prove that a person knowingly transported an illegal unless he is trafficking humans.

The tenant will have find temporary street parking or pay for storage somewhere.But if it's just an ugly junker that they are using for transportation?

The thing the rich want to purchase may be a utility bill, a regular vacation, or transportation (car, Netjets, or whatever), but rather than paying for the thing from current income they first invest in an asset or business and then use that to pay for consumption.

Enclosing it is fine in many locations.

They're fully enclosed.