If you try and tow your vehicle backwards then every time you make a turn it places forces on your steering components that the car was not designed to take for long. Add in the weight bias and then throw in a few pot holes at 65mph in reverse and you will see that it's an accident waiting to happen.
If your steering let's go then the vehicle will try and spin around, taking your tow vehicle/motorhome with it. At speed that will flip your rig instantly.

The reason is that the caster built into the steering, to make it return to center going forward, wants to turn the wheels to full lock when the vehicle is moving backwards. How much confidence do you have that your anti-theft steering lock will hold the front wheels straight?

In an emergency then you can do it for a short distance assuming you apply a secondary restraint to the steering wheel (but if the steering components let go then thats not going to help) and drive slowly.

You may have seen recovery vehicles towing that way - they are taking a major risk in doing so and normally they only do so for a few miles - not several thousand that you may subject your rig and toad to.