The nice thing about providing a washer/dryer is the tenants don't have to move their own because there is an increased risk of scraping walls and floors, hooking hoses up incorrectly and causing a leak, or some other problem.

Talk to @Avery Carl at the short term shop she’s top dog in vacation rentals This was typed on an iPhone while on the beach in the Florida panhandle 

This would include season yard work like lawn and snow, rolling trash bins out to the street etc - and in the odd case that something would leak, call a plumber.I have been working with probably close to 100 house hacks in Milwaukee over the years and I have never heard of a bank actually investigating actual residence.

Also look for went areas near the tank and greener grass on the drain field, if it is very close to the tank location than you might have a leak. 

If you don't pump it assume Murphy will apply his law and it will be leaking, smelling, and more

but stop by the property and have a little informal chat with the tenants,  I once went in to look at a duplex with great numbers, but once I gained the tenant's confidence, she went on and on about leaking roofs, patched up work, cracks, etc.  

To get a leak detector out there is $400-$600.Couple of questions:- Should I be concerned about the situation and how long it is going to take to get a leak detector out there (4 days)?

I mean this is not like a gas station with a leaking gas tank for 25 years..

Again, I'm not suggesting that there need to be "handouts" for scenarios where someone feels "entitled" to an iPhone or a Lexus or even to eat out every week. 

Does anybody recommend a sign-off form I should provide to Tenants after I had major repairs done from a shower valve leak ?