Mercedes runs their Sprinter line with the Mercedes star on the front. I know some after-market modifications can turn these into really nice RVs, but they're mostly in the "work van" category. In Europe, Mercedes doesn't really have the same connotations of luxury/aspirational purchase that it does in the US, so maybe that explains the willingness to slap their insignia on a work van. But nobody in the US seems to think Sprinters dilute the perception that other Mercedes are a luxury.
Edit: ugh I see at least two others made exactly this same point while I was typing my comment. I guess it shows that it's a valid one...
Lexus is also entering the luxury van segment. They're repurposing the LS badge from their flagship sedan to a van which, in concept form, has 6 wheels:
I think that's true as a personal vehicle. But you'll see them driving around with ladders, pipes, etc. on them as direct competitors to the Ford E-Series. You definitely don't see the Ford vans turned into luxury RVs though!
Edit: ugh I see at least two others made exactly this same point while I was typing my comment. I guess it shows that it's a valid one...