I have yet to do a 1031 exchange or a cost segregation study (I'd like to see how this plays out long term when selling or doing a 1031 exchange into a different property) or expense business travel/mastermind/classes. 

Also, my many years of contacts in the business become my clients contacts.

Michelle Wang,With all due respect, you should make plans to be in another business once you're out of Real Estate Investing (Residential, Income Property).There are Members of our MassRealEstate dot net Association that come crying to me about similar situations as yours i.e.

Since it's your current primary, you would need to move out, change your address, and likely get a lease in place before closing on the DSCR loan since the lender needs to prove this is a "business purpose" loan and not a loan on your primary residence. 

I'minspired and always on the lookout for new ideas, trends, and success stories.

I use Coterie for business liability. 

I am interested in potentially buying a trailer park as the investment is in the land and the tenants rent the lot, bringing their own asset (mobile home) to the location and typically, they stay for the long term. any invoice for a new real estate investor trying to get into this business?

Look at buying my first investment property (probably a house in the 100-150k range) and begin looking for a tennant.I can imagine there a lot of different theories/ideas with what one could do here--I am just curious to see what other people think.

Quote from @Andrew Steffens: I have no idea who that is hahaI have seen an increase in this (like everyone else) because Airbnb spoils guests. 

I wouldn't let the idea of purchasing a home that has oil heat deter you.