Unfortunately, STR owners don’t want to rent a card because of liability issues.

We were going to then take some of that money and take a chunk out of a higher interest rate credit card.  

I would tell you to pay down your credit cards even if you focus on just one card at a time to get the balance down to 30% or less of credit limit.

Leasing a Maytag laundry center from Wash.com would cost me $100/mo, but reviewers say they can take weeks to come out for repairs.A local place called Mission Laundry Equipment can lease me a Speed Queen laundry center for $110/mo, or sell it to me for $4,299 (actually $5,450 with all taxes and fees for delivery, installation, and setting up the credit card system).

Got $100k business line of credit with 710 credit score to buy some more properties.Do you think it is better idea to buy a rental house (worth $70k) with the credit card paying all?

Where you use your card leaves a trail.

You can get a cash advance on your credit card.

We play with the cards and the deck we are given.

Create the LLC by paying with a credit card.  

Establish credit by opening a Business credit card linked to account or funded account and once you have the credit, and the first years 1099 or Schedule C & E I would see if you can go Non/QM 1 Year or straight Portfolio vested in the LLC.