Firefighting halftrack.
https://s3-us-west-1.amazonaws.com/h..._halftrack.jpg
Previously:
https://www.homemadetools.net/forum/...437#post169805
https://www.homemadetools.net/forum/...830#post152439
https://www.homemadetools.net/forum/...3576#post99483
https://www.homemadetools.net/forum/...792#post159886
https://www.homemadetools.net/forum/...783#post102468