Well I pulled the trigger and bought the van. Thanks for all the tips, this is the one that had a roof leak. The van cleaned up nice with only 2500mi on it, it looks like it came off the lot.
Hey Magnus -- similar situation here - I found a 2002 SMB E350 V10 - in Utah - with only 3,850 actual miles on it. Overall just a few minor problems with interior fabric needing to be glued down a bit - engine exhaust studs with only very slight rust - kept in controlled environment. Keep my fingers crossed every time I drive it though --- good luck !