There is a couple of problems with towing backwards. Tow dollies work best with the weight on the dolly. When the weight is on the ground, it tends to swing around, very easy to start swaying. My brother tried to tow a VW Beetle frontwards, and it swayed all over the road. Flipped it around and it towed fine. The other problem is that the braking is done by the tow dolly. If the tow dolly has no weight on it, compared to the rest of the weight of the car, the tow dolly brakes will be ineffective. In an emergency, they would likely skid sideways. If you have a really heavy motorhome, and a really light car, you might get away with it, but normally it does not work very well.
If this is a permanent toad, they make a drive shaft disconnect, that will allow you to disconnect and reconnect the driveshaft in seconds, without getting dirty.
IRV2