Personally I like 1 savings and 1 individual checking for each property.

This property is unique in that we can rent out the whole property or we can rent out the property by individual rooms because each room has its own bathroom and it runs as a bed and breakfast.

@Alecia Loveless is correct--tenants need access 24/7 to their electric service panel, water and heat, assuming those are individual utilities for each unit. 

I actually keep a list our bookkeeping firm recommends based on firms/individuals we and our Clients have had good experiences with as well as I've personally had good experiences with.

Have you always invested in owning the parks, or have you purchased some individual mobile homes in parks you haven't owned also? 

For example: the multifamily sponsors will usually pay the considerable extra cost required to do a cost segregation analysis and this will increase the investor depreciation in the early years (versus an individual, direct investor who often will skip doing this because of the cost).The advantage of the passive investment is that you don't do any work.

Specifically, I am looking at partnering with an individual who owns securities (stock and mutual funds) having them take out a line of credit against their portfolio (SBLOC) at a low interest rate, and using that to purchase properties rather than using a mortgage.

That's also not a deterrent to REI...and it never was, and never will be.The real key comes down to analyzing markets, and not just individual properties. 

The government has tried it with section 8 and rent control in some cities , we all know the end result .You would be better off starting a jobs program teaching the trades , educating them on finances and work ethic and then rebuilding abandoned properties for them to buy 

I desire to connect with individuals who have had experience investing in real estate while serving in the military on active duty.