No rust on my 10 year old W639 Vito, or any of the dozens owned by dog training friends (some of whom are on 2nd or 3rd Vitos). 638s and very early (ungalvanised) 639s are complete rust buckets though. A friend had a 54 plate Vito that almost fell apart.
Vitos are used by the Police and as taxis in London, and I've never seen a rusty one of those. Or any of the Vianos that are used all over as hotel/airport shuttles.
Of course there may be the odd one (as I've heard of occasional modern S Classes with rust), but it's definitely not a major issue. And if you're buying a 10+ year old one it should be pretty obvious if there is a bodywork problem.
Vitos are used by the Police and as taxis in London, and I've never seen a rusty one of those. Or any of the Vianos that are used all over as hotel/airport shuttles.
Of course there may be the odd one (as I've heard of occasional modern S Classes with rust), but it's definitely not a major issue. And if you're buying a 10+ year old one it should be pretty obvious if there is a bodywork problem.