The HF furniture dollies are very useful. I have them all over in my shop! I have three of them with engines sitting on them. I built a mobile grinding station out of a free sink cabinet and bolted the cabinet to one. I have file cabinets with all of my vise grips and body tools sitting on one and I use them all the time for moving rearends and tires and wheels around in the shop.
You can't buy the casters alone for 20 bucks so these things are a good deal when they are on sale.
Don't mean to hi-jack...
Mark