Collapsible step trailer ladder.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...ler_ladder.jpg
Previously:
https://www.homemadetools.net/forum/...088#post149532
https://www.homemadetools.net/forum/...039#post149277
https://www.homemadetools.net/forum/...702#post147876
https://www.homemadetools.net/forum/...785#post140176
https://www.homemadetools.net/forum/...664#post123576
https://www.homemadetools.net/forum/...494#post117152