To me the Dolly Creeper would work well on a Polished Ballroom floor and if I were about 90% less clumsy.

Unfortunately I have given up all semblance of trying to use it on bumpy driveways.

The problem is that between the bumps catching the wheels and my clumsiness I somehow end up teetering on two out of six wheels and then falling off the ^%*( thing. Or else one of the wheels catches on a Ratchet or a crack in the driveway or an air hose or light cord and my weight shifts and then the process is repeated. Or else the dolly wants to go backwards but i want to go forwards. My favorite is when it hits a Jackstand and gets stuck

Using a Dolly properly to me is like making love with an elephant. To me that means jsut follow the dolly. Of course that might put you under the transmission and not the engine where you want to be.

Maybea ballerina or or a circus acrobat could use this thing correctly. But my salvation has come in the form of Cardboard Sheets I lie on the ground.

Finally a dolly raises me say 4" which is 4" less clearance or 4" higher I have to jack the car. Trying to use it to swap a Tranny is really dangerous...