On the bottom, the Van Compass ladder attaches to the top of their Rocker Guards, the Aluminess ladder attaches to the pinch seam. For the VC ladder there is no installation option without their rocker guards also (pictures on their web site).
On the top (at least on a RB), the Van Compass ladder has no screwed attachments that penetrate the van where the Aluminess ladder utilizes two screws. I have pictures of both, but no access or time right now, pictures will have to come later.
There is some side mirror vision obstruction, but nothing to worry about. After driving for a couple of hours you have become accustomed to it and hardly notice.
In my case, which is probably the worst case scenario because I also have the HiLift jack attached vertically to the leading edge of the VC ladder, there is no noise when driving and no noticeable change in fuel mileage.
“Flint” - 2016 SMB Sprinter 4x4 144" RB 150S w/ PH