I would say it is a scam!!
Unfortunately, there are a lot of scam listings - rental listings - on Trulia and other online sites.
The scammers can be very devious. The often use photos from real listings but cut and paste and hijack them to create the phony listing.
They often have creative stories about being out of state - many claim to be missionaries!!! (red flag if they cannot show you the house in person, or at all!).
If something seems too good to be true (price is very low) - that means it isn't true!
Finally............If they ask you to wire money for the keys - run in the opposite direction as it is definitely a scam.!