The guys that do that *usually* have decent paying day-jobs, and are more interested in having a bunch of paid-off properties for themselves or their kids when they retire than having an extra $150 per month right now. 

If you have 2 panel boxes its simple and usually easy .

Private money is usually good if you are going to exit in a short period of time (flip, quick refinance, capex, ...etc).

That usually does not make sense.

The seller will tell you one thing, but I've found it's usually pretty inaccurate.

Pretty simple, really.Anyway, if they never sent back the signed extension - usually, you would have signed your copy and sent it to him, or both done at the same time - then you have nothing, and I would just proceed with the intention that they are to vacate. 

When all the viewer has to do is click a button to say "I'm interested in your listing, when can I see it,"  they don't have much invested and usually don't even remember which houses they sent messages about. 

I would say no because 1) she doesn't report her income (not a good sign) and 2) if you feel a larger deposit or extra prepaid rent above what you would normally require, it would seem that you are already expecting her to be a liability - which usually, they will be. 

I usually set ACV at around 75% of rebuild cost and the highest possible deductibles. 

A leach field is usually pretty easy to spot too if you know what you are looking for.