Not to argue or contradict @Ken Rishel as I respect his knowledge, expertise, experience and obvious success in the MH Industry, however, one thing I've personally experienced over the years as a General and Manufactured Contractor, Manufactured Home Dealer, Real Estate Broker, Developer, investor and property manager (my own portfolio) is that in park sales personnel, be they the manager or an in park sales dept., is that it can be construed as somewhat of a conflict of interest to residents wanting to sell their homes if they feel they are obliged to list their home with an in park employee vs a RE professional or MH dealer of their choice.There are a few MHC's in my neck of the woods who have done and some that still do this and the homeowners/tenants really resent it and often opt seek their own representation.

Heaters in winter are a risk to life so have a few spare oil radiator heaters on hand you run over there until the HVAC guy can come on site.EMERGENCIES: The following conditions shall constitute an emergency for after hours service calls and nothing else.When there is an immediate risk to human lifeWhen there is an immediate risk to real property (principally land and buildings

I want to be able to do something bigger than myself that can leave a lasting impression on humanity before my time is up, something that can transcend my lifetime and do good for others for years to come.As for the avenue or niche/strategy I think would work best for me?

All 15 are exactly the same, they look like the habitat for humanity houses. 

Make sure you set up a separate entity for your long-term stuff (or even better an LLC for each property...) and one for flips if you end up doing any - that way there's no chance of being hit for self-employment tax as a 'dealer' under IRS code, for properties that you should have only been paying long-term capital gains tax, on sales of properties that you've held for over a year.

Ask your lawyer what you should do about that, I might be calling Health & Human Service if it was me.  

I'm currently a car dealer who's fishing for more value in my world.

They may use terms as licensed or authorized dealer or licensed plumber.

There are products that go over the knobs to a gas stove that require a human adult operator. 

We do a good job of compiling voluntary liens (mortgages), but we don't currently track involuntary liens (IRS, judgements, etc), and since our systems build title history on tens of millions of properties, no human has verified their accuracy, and we certainly do not guarantee it.