Right now, we’re carrying about $60,000 in debt ($40,000 in credit cards and a $20,000 car loan).

If I recall correctly, Rent Redi even gives them the option to pay using a credit card. 

am working with them now and had the first policy (with Spinnaker) cancelled for nonpayment/late payment so we rewrote another policy (with Millenial) and having the same payment problem again but at least they are communicating that cancellation is coming. they want me to pay by credit card over the phone so the payment wont be late and cancelled again. but when i go to mycoverageinfo.com to check on status it shows its been paid.

If you have a credit card with a high limit or a line of credit on the existing duplex that might give you some wiggle room.

Similar to a credit card.

I do direct booking through the Houfy website, taking credit card payment by Square. 

I would try not to tie up any of the principal in down payments.Personally, I had a family member do this same thing, but they used an investment portfolio as the collateral instead of real estate.If you play your cards right, this might be the only short-term money you ever need.Please let us know what you end up doing.

Of course credit card is going to be like 3.5% but it does kind of such because it's already hard to get tenants to pay it lol. 

I'm looking for Propstream, does it have different post cards, like deal machine???

I have two banks that have done so as well as a credit card, and know of a couple of organizations that have as well.