Borrowing: If you have an investment or business that makes more money than the interest rate costs you on the debt, it might make sense to get a loan to multiply your returns.

They operate like a credit card - when you are not using the money you don’t accumulate interest, when you are using the money you accumulate interest and need to make monthly payments.

To be fair however, I'm looking for permanent debt on a mobile home park I own in which the trailers are also included in what I own.

So if someone tells you, it does not matter about liens behind you - it does.There’s one more ; the borrower has increased debt service and when it either turns negative or leaves nothing “in their pocket” they may lose interest in the property, decide to stop paying all mortgages, and put whatever income they can into their pocket until they lose the property to foreclosure or one of the lenders obtains a court order prohibiting such.   

You'd be borrowing a slightly higher amount but your monthly debt service could drop by a few $100s. i.e.

I am also going to try to start dispute with my credit card.

I forgot to mention, it's meant to be turnkey so they manage it, and their split is 10% of gross income before all costs and debt service etc. 

With your income and plan to pay off student debt, you’re in a strong position.

This is basically an unsecured personal loan, like a credit card.

If you did not and it’s unsecured debt you could be out of luck on some or all of the money as depending on his situation unsecured creditors in a bk may receive pennies on the dollar depending on what he can afford and if converted to a ch 7 you would get wiped out.Even in 2nd position he could argue the property is underwater and wipe out your lien.