Sled Dollies / Wheels ?

[FatDogX]

Looking at getting some new dollies, came across and these and had a couple questions. First off anyone has had any experience with these, good or bad? Second, these two companies appear to have the same thing but I just wanted to make sure one isn’t a knock off.

http://www.extrememax.com/catalogs/snow/dollies/power-wheels-standard.php

http://www.suregripdolly.com/index.html

 

[CO 2.0]

I have the sure grip ones. I abuse them and they are still great. I have gone down the street at 40mph with these on the front. I somehow got a chunk taken out of the skid dollie but they have direct replacements for that at ace hardware for ~$10

Both the ones in your links look the exact same

 

[FatDogX]

40 mph!!!!