There are some good dollies designs none that have it all.
The TS and Yeti wheels are very different design but from the videos they appear to handle similarly. I have made 5 different (TS design 4 wheel versions) of sled dollies since 2011. IMO they handle best when you lean your bike to the outside of the corner. Once you get the outside lean mastered you can get around pretty good. You need to develop a different skill set to ride a snow bike on a Dollie.
My experience has been only the most robust dollies might survive off road and ruff loading and unloading.
Yeti Wheels seems like great Idea! I would luv to try them. I have bent shafts on 4 wheel dollies. I would confine current design to transport and very light duty ferrying to the snow. The Yeti should be far better crossing snow and mud than the 4 wheel TS Design.
To go down rocky roads for now I would have to go with the TS style 4 wheel.
I would like to see a bigger mount and Axles on the Yeti before I depended on it to function off road.
Overall I think I would have to give the Yeti a go. :face-icon-small-coo
After all My Snow check TS is coming with transport wheels.