You can go to rvt.com and do a search for "Class B," "years 2006-2012," "length 1ft to 22 ft," "diesel" and you will get about 40 hits. Then you can look at the different models to narrow your search.
I just did that and found various years of the following with rear sofas:
Leisure Travel Free Spirit
RoadTrek RS Adventurous
PleasureWay Plateau
RoadTrek Agile
If you want a van with three or four seats up front, your options are going to be a lot more limited and many of your choices will be gas. The only diesel I know of is the RoadTrek Adventurous which had options for four seats or three seats and a cabinet.
Also, if you want to pull a boat, you need to look at the GVWR. Some of the Sprinters of that era are on 2500 chassis and are almost at their weight limit with the conversion alone.
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2018 Coachmen Crossfit
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