I'm glad this thread popped back up. After I last saw this thread, I stumbled across this thing but couldn't find the thread again to post
seems like it would be overkill for a tow dolly, but some folks may like it, for rough ground or for other reasons
looks interesting to me....wish I had one for my boat!
https://www.etrailer.com/Hitch-Acces...let/TVXL2.html