Motor Dolly suggestions

I use a large mover's dolly and an old 15" tire and leave the pan on. It took a couple of tries with the engine hoist to get it balanced, and it's nowhere near as stable as a dedicated stand of engine dolly, but I don't have kids to worry about, and this was the cheapest I could imagine. Still, $65 is pretty attractive. My "rig" _is_ kinda unstable.