Battery powered automotive dolly.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...wer_pusher.jpg
Previously:
https://www.homemadetools.net/forum/...331#post188737
https://www.homemadetools.net/forum/...875#post186895
https://www.homemadetools.net/forum/...718#post182831
https://www.homemadetools.net/forum/...042#post176157
https://www.homemadetools.net/forum/...493#post193022