It's up to the tenant to ensure they have sufficient funds, if a Cozy payment fails or a check bounces I then charge the tenant a fee (assuming this causes it to be late).If you're really concerned you can take what @Jonathan Cope does one step further and require payments on, say, the 25th in your lease.

Most expensive route of course as you are paying them by the hour, but I learned a great deal and am now self sufficient and they've been tremendously helpful in giving me birds eye view of what I need to fix and focus on next. 

Also be aware some commercial lenders require you to have sufficient liquidity after you purchase the property.For example, Freddie Mac/Fannie Mae require enough cash for like 6 to 9 months of mortgage payments.

I know I could probably go hard money but my concern is being able to refi into a normal bank loan within 6-12 months because I'm certain my equity won't be sufficient by then, even if I'm reinvesting all profits, and especially since the payments will be interest only. 

You gave them sufficient warning, they know the home is no longer vacant.

I've been evaluating a mobile home park with about 1/10 acre of land per pad.  Is this a typical amount of land a resident would expect? 

That being said it is possible to get a line of credit against provided there is sufficient equity. 

Only problem was that his numbers didn’t account for management, capex and sufficient maintenance costs (note, there is a big difference between looking at the prior year’s maintenance expenses versus an average year’s expenses – especially when the property is about to be sold!).

I verify their income is sufficient to pay the bills.

For investments that are relatively static and singular in nature - shares of a private placement for example - the services of a self-directed IRA custodian can be sufficient.