Right now the popular Class B RV chassis is the Mercedes/Dodge Sprinter. One of the big sales factors being the small diesel returning 20-22 MPG compared the Chevy/Ford offerings at 12-14 MPG. I know GM has targeted this for the under 8600 lb GVW vehicles but it sure seems like this would be a good alternative to the detuned 6.6 Duramax shoehorned into the current Express 2500 and 3500 vans.

Granted vans aren't as popular or have the volume of pickups, but whaddya think the chances are of this engine showing up in a '10 3500 Express?

i think it would be good candidate.