carringb wrote:
Neither, at least not in a conventional class C. Ford stopped the E450 diesel in 2010, and GM does not offer the Express 4500 in diesel for RV applications. You can get the RV-prep package with the 3500 diesel, but that will limit the body size to about 24'.
You can get an F550-based "Super-C" with the 6.7L powerstroke. The GMC 5500 chassis went away in several years ago.
This. Not really any selection of conventional class C out there with diesel. You'd have to go a Super C then you can find all three available at least used as the Chevy duramax platform is no longer made