Originally Posted by speede5
Good write up, how stable are they? They look very tippy, especially with the jackstands. A little momentum and a rock on the floor could be trouble. I would imagine they are fairly safe with just the wheels on them, but with jackstands you are raising the c of g quite high. You really need to move the casters iout from under the wheel, like the other design where the tire sits in a cradle, there is no way that is flipping over.
That said, as long as they are your tools, and you know how to manage them, safety is in your court. Maybe don't let others use them though.
I though the same , it seems to me that the tires aren't supported & sitting to high. They need to set down inside of a frame, one crack in the floor or a any trash and the front wheels will be on the ground.
They are all good and all that, but a closer replication of the ones the idea was copied from would work and be much safer .