Portable Ladder (video)

Very good, a few nice a few other amazing innovations too!
We had that at my tree service in California. It was just OK. I think it would be more useful for homeowners than tree workers.
Ours was an eight footer I believe. It usually resided in the bosses truck. I used it a handful of times.
I could have used one of those back in college when I had my own window washing business. ;)

Instead, I toted around a 12' small extension ladder in my Geo Metro.--Yep inside! I laid back the passenger seat, put it in all the way to the floor, and the ladder fit perfect!

For tree work?:? Now that is a different question.