Thought to share the evolution of a wiring creeper:
At first I used the Micro dolly but it was too high and the wide spacing of the rollers snagged frequently on layout legs. Plus it hurt my back. One day's use and it got put away.
The next thing I did was to just slap a 3/4" ply scrap and a pair of 2 X 3s under an old furniture dolly. Crude but effective. Used it to finish a project.
On the next project I thought to look to save my back so I grabbed a long neglected chair shell and dropped it on another 3/4" scrap suspended from a cut down dolly. The chair back saved my own back. Now long hours pulling wire pass easily. 10mm flat head machine screws pass thru the 23/32" Advantech which works out well.