I own a generic version of this one from Amazon. I love how light it is and how easy it is to extend and compress. I considered the Thule one just for the suction attachment, but opted against it in favor of a highly rated one on Amazon.
How did you like the suction attachment? I wasn't sure you attach it to your van without being able to reach that high without a ladder. I guess you could temporary lean it against your van, place the attachment, then mount the ladder into it?
Either way, good luck with your sale. These things are awesome, especially if you have multiple locations that you need to access on your roof. Side/rear ladders too look cool though.