Can additional back up sensors be added

[jeffxlh]

Just woundering if I could add two more sensors, one each to the rear corners. Has anyone done this?

 

[BobN]

Don't know about sensors from Toyota but what about a minicam? I seen one on the web somewhere for something like $89. It bolts on to your license plate and then there is a little TV on the dash. It's for reverse manuevering but might be useful otherwise as well.