I plan on putting them through a new application so that I have the experience and also all my i's dotted and my t's crossed.

Just my initial thoughts based on the limited information, I wish you the best with whatever you decide.

Let's survey the landlords here:Who here would rent to a tenant applicant with a bk within the last year or two, that couldn't show you that it was due to an unforeseen medical emergency or something else completely out of the tenant applicant's control?  

I request a credit limit increase twice a year on my main card.  

I believe there are limits for the credit, but it sounds good in theory though.

However, you may be able to work out a different percentage (including nothing down) with your lender.The Refinance step still is applicable whether you have a Private/Hard Money Loan or paid all cash for the acquisition.  

If you would like higher limits than $1M, you would get an Umbrella Policy.  

Other than an application, lease, condition checklist and possibly a lead disclosure, what else do I need for paperwork to place a new tenant?

A first-time investor with limit resources to fund the remaining balance of the loan.

Their goal is to collect application fees and rent and deposit from an unsuspecting victim before disappearing.