That mortgage will tie up your credit and your VA entitlement, impacting your ability to purchase other property.

It's got everything from $250K townhomes to $5 million mansions and great rental histories.

I assume this is deal one but as long as they have good credit they can get entry level bridge loan terms. 

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Find out what you qualify for from a loan officer or credit union. 

Verifying last 2 years of rental history very important!

My real estate agent, who has a long prior career history in construction, seems to be happy with both the properties and has inspected them in detail and also been under the crawl space noting new plumbing, electrical and foundation sister-in-law beams too.As mentioned it is looking very likely the current buyer will not meet the closing deadline at which point I am next in line and have got price agreed with the back up after a few phone calls today. 

This election and time in history will go down as the "Idiot Olympics".

Any potential buyer with an IQ above 50 will insist that these are replaced or they are given a credit. 

I have occasionally provided a rent credit for a good tenant to help them with the purchase of a lawn mower or weed wacker.