There are a host of common sense reasons for this and mostly revolving around exact locations.

Typically this revolves around time, risk, and control, aka: debt, involvement, and...well, control.

Revolving lines, etc. that can replace an appliance or unexpected initial cost once renters get in can go a long way in reducing your personal risk and can help you quickly build your business' credit as an asset that will help you to buy additional properties at lower rates. 

I've got a few other things going simultaneously as well in an effort to make sure I have some kind of cash flow as I transition out (Starting a business which I won't plug here,) but again it will all revolve around the end goal of investing in real estate and building out long term wealth.

keep in mind most business lines of credit from a bank  TRUE unsecured LOC's are on one year revolvers and they can and are frequently called.. another tid bit is many times they have a 30 day resting period per year.. meaning you have to pay it off and rest it for 30 consecutive days.these are true unsecured LOC's from Banks.. also careful with the fake business loan lenders that say your all approved just send me a little money up front.. in almost all instances they are simply scammers crooks and thieves. 

Well, actually I watched him bring it in on my security cam but you get the idea.

Since my divorce in 2009 (and her side forced a BK), I've had to live with Debit cards and honestly, it is refreshing to not have to worry about paying down any 'revolving' credit - which, since the 80's?

c) Am I no longer qualified for the FHA (assuming I never lived in my rental)? 

A few thoughts:Prepayment penalty cam literally be anything you negotiate.

My opinion is that it's not the inquiries but the revolving usage since you just took out HELOC.