VW T4 Westfalia was imported by Winnebago 1995-2003 as Eurovan Camper. They used the long wheelbase version, 201 inches overall length.
Since 2007, the standard wheelbase Express van has been 224 inches overall length, the standard length E-series 212 inches through 2008, 217 inches with the nose stretch for more crush space in 2009. The standard length RAM 2500 van was a bit shorter than Express and E-series, at 205 inches but production stopped in 2003, before your cutoff.
Ford, Chevy, and Dodge all once built vans under 180 inches (15 feet) but Ford and Chevy discontinued those before Chevy Van became Express and Econoline became E-series. Dodge built the RAM 1500 as a short van to the end, but I think it was only as a wagon, and any Class B would have been a custom conversion.
Nissan's full size van is not a shortest candidate, at 240 inches.
PleasureWay built the Traverse campervan on the standard length E-series.
Roadtrek builds some models (170 for sure) on the short wheelbase Express. Other manufacturers may also have a lower cost short model.
You will find used Sportmobile conversions on the standard length vans, these are all built to customer choice, and many choose the shorter length for a purpose. Sportmobiles might be built as B motorhomes, or as camper vans, or in other custom configurations (band vans, mobile offices, workshops, etc), so in looking to buy used you need to find out just what it actually is.
I have friends with Westfalia campers, second generation T2, Vanagon, and Eurovan models. They like them for getting well into the forests where the roads are narrow and parking spaces small. But they are really more for camping support, not for a motorhome lifestyle.
