With a fully racked high top I skipped the fixed ladder and went with a telescopic one. The fixed ladders disadvantages are it’s small width, steep angle, fixed position and security. But the most important for me was coming off the roof with no hand hold and searching for the rungs blindly with my foot. I made sure mine would extend higher than the roof line by 2’.
As someone who has fallen off a ladder before I spared expense and went with a big time ladder maker for one reviewed high on stability. It is heavy but it is stable, even has some stabilizers that extend laterally from the bottom. Collapsed it fits easy in the back.
I doubt this ladder is exported, it is the idea is what I want to share.
In practice I have found that being able to move the ladder around the van has proven to be an asset.