I tried to log in, both from my phone and on my computer but I kept getting that mysterious 'sit tight' message others have written about in other forum posts.

And that PM that didn't call you back, I hope it wasn't an emergency because never returning phone calls will ruin a business in no time.Good luck!

ok and what about putting in a seperate, free standing mobile home to rent out? 

You can also invest in a paid service like Intelius and reverse look up their phone numbers as another angle.The time of day can make a big difference as well.

They're getting marketed to by a dozen other investors and if they call you and have to leave a message and they call me and I answer the phone, who gets that deal?

PM me with your phone number.

The bank can look at the Seller's most recent tax returns to show that it has been generating income over the last year or 24 months as proof.You can additionally put a test advertisement out for the property at a given price and log the number of phone calls you get.  

In those price ranges there are some interesting opportunities in the mobile home space, but not a lot in SFR.

Everyone likes to help each other, and when you leave those meetings/phone calls you will be revitalized and excited!

I'm in a very unique financial position (you can google me), and we can discuss in detail over the phone or some other private medium.