Door dolly.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...y_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net/door_dolly.jpg
Previously:
https://www.homemadetools.net/forum/...385#post177386
https://www.homemadetools.net/forum/...378#post161836
https://www.homemadetools.net/forum/...154#post157622
https://www.homemadetools.net/forum/...446#post154766
https://www.homemadetools.net/forum/...490#post142913
https://www.homemadetools.net/forum/...584#post143200
https://www.homemadetools.net/forum/...702#post139894