One thing I also agree with Grant Cardone on is that you want to be in a market that has some appeal and exposure to the rich, especially the international ultra wealthy. 

That's because anything over 4 units will require you to follow the IBC (International Building Code) and require an Architects seal.

Are there really jobs out there as a REI Assistant/Intern?

@Nic Lee i have some international commercial off the market deals, feel free to connect with me so we can discuss this in details.

Are there international complications I/we should address?

I am set to start my full time job starting January and I have been working as a intern for this summer.

I know that I can't use that formula with internal management and staffing (leasing, management, maintenance, etc).

It's hard to tell without knowing the exact breakdown of what value you are assigning to each component of these parks. 

They've decided against taking on that risk and instead are passing that on to you, their client.As landlording is a business, many of us choose not to add an additional risk component by prohibiting breeds of dogs the insurance data shows as a risk.  

Those who are self-employed (wholesaling generally qualifies) can get the additional benefits of the Solo 401k including: Compared to an IRA, Solo 401k contributions limits are roughly ten times higher.There is no custodial requirement for the 401k.You don't need the additional expense and administration of an LLC to have checkbook control.There is a built in-Roth component whereas IRAs are either traditional or Roth, not both.A spouse can also participate in the same Solo 401k plan.The Solo 401k has additional tax benefits over an IRA when investing into real estate using leverage.The penalties for prohibited transactions are less severe, though it's best not to utilize this benefit :)