Towing with engine running?

I do this all the time with my 2005 Ford Focus. Remco and Ford say it is not tow able. I have been towing it since 2009 and now have over 104,000 miles on it with no problems. Last fall I sent in an Oil Sample to Blackstone Labs and they said I should change my oil in the next few thousand miles as it is approaching the limits on some tests. This is the original Transmission oil in the car when I bought it new in Feb 05, Ford recommends 30,000 Oil Changes in the Transmission. One thing I did do was add an additional Oil Pressure Switch to the engine and ran the wires up to a Power Plug in the coach drivers bay. I plug in an Amber Magnetic Tow Truck Strobe light and when the engine is not running the light flashes. This will warn me if my engine quits and allow me to pull over before I ruin the transmission. Never has quit on me yet and always reminds me to start the engine before I roll. In the winter I use the Strobe light on my Tractor when I am moving Snow so anyone will have a chance of seeing me after dark. Good luck and enjoy the towing.