Self-propelled modular transporter - GIF

Self-propelled modular transporter.

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Previously:

https://www.homemadetools.net/forum/...549#post155160
https://www.homemadetools.net/forum/...655#post132873
https://www.homemadetools.net/forum/...021#post129795
https://www.homemadetools.net/forum/...210#post126408