Sorry to respond late.
The dollies are custom. However Princess Auto sells very similar and are the same height off the floor. I found the hubs rotated in the dolly when moving the Boler
. In the picture I placed a 2x4 in front and back of the hub to minimise rotation and to stabilise I placed a 2x4 under the bolts and in back. Bungee it to the dolly and its secure. I have about 3" clearance under a 7' door. I do not have a ceiling vent in yet.
This dolly setup sure makes it easy to manoeuvre the Boler
in the garage. I use a hitch dolly to pull the Boler
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