Backing up Flat Towing Behind an RV

I went ahead and tried this and it worked as well if not better than I had expected. I actually backed down the entire length of my driveway and it was working so well I decided to see if I could back out the end and it worked. Don't plan to do this regularly but I do plan to keep these with me when I am flat towing just to keep my mind at ease. Yes there are drawbacks. They are large, they are pretty heavy and they are even a bit greasy and they surely will not work on bad pavement. But as long as I have the space I will be bringing these with me from now on.
Harbor Freight wheel dollies. I did not bother spending any video time showing how to use these because there are countless videos out there showing that. I did spend a few minutes greasing the caster wheel bearings as is suggested on many videos that cover these dollies.