REAR OF CAR DOLLY QUESTON

I am going to be taking my rear end out of my 67 barracuda soon. I don't like the idea that it will be sitting on jack stands. Not that it wont be safe but I like the idea of being able to move the car around. I have it on the dollies that go under the tires right now. I have every thing I need but the steel & casters to build something. Anyone have any ideas ? What to build ? Where to mount it ?