Of all of the accessories i've purchased for my Westfalia, there's one that gets more attention than all the others.
My ladder. Seems silly to me, although perhaps I shouldn't be too surprised, it's handy as hell. Early on in my van build out I decided that I needed to have a Yakima Rocketbox. This required purchasing my roof rack setup, and locating a sweet used Rocketbox.
It was only upon installing the Rocketbox that I realized it was next to impossible to reach from the ground. A solution was needed.
Meet the Rocky Mountain Westy Vanagon Ladder (here). This handy, super simple ladder mounts to the rear jack point on the bottom and to the rain gutter on top. Its powder coated a textured black, and looks sharp. In my opinion it beefs up the look of that side of the van. Most importantly though, it makes reaching stuff on the roof (in my case my Rocketbox) a snap.
At $249, it's not exactly a cheap solution, but it's well made and has held up well. There are other ladders out there, GoWesty sells a ladder kit for their Universal Carrier (Shown supporting my Spare Tire in the photo above), however that solution would put me behind the box, which wouldn't have solved my issue.
I really like the side mounted ladder versus the rear mounted ladder and I think you might too.
PROS: Sturdy, Lightweight, Well Constructed, Looks Cool, No Drilling Required
CONS: No way i've found to secure it to the van for Anti-Theft purposes. The ladder does break down easily for stowage (although i've never done this)