I have a ladder, and hate that I can't use my window anymore, mostly to easily hold my surfboard without having to rack it.
As a ladder owner, I can tell you that with it I never use it, or only one run anyway. The rungs are just too small on the left side as it clears the tire to use it at all. 90% of the time I end up standing on the spare.
Thinking about building a couple of rungs that will mount behind the tire and give you the one rung I use, and retain the utility of the window.
What I want to see someone invent is a device to allow the window to "crack" open a couple of inches to eliminate the helicopter effect of having your windows open.
Thought about making a clip that would hook the window to the ladder too to accomplish something similar to get that functionality back.
It does look cool though, and that is probably why I haven't removed it. Nothing to do with utility, that's for sure.