Tow Bars 71 Duster 318

I talked to one of the local transmission shop about towing without removing the drive shaft. Other than the answer I have heard over and over, he had an idea off the top of his head.
It May be possible to fill the transmission full with oil. This was it will remained lubricated during a longer tow. The remove the excess oil before driving it.
Not a bad idea, but I am not going to try that