With a lot of looking, you "might" be able to find a used small motorhome on the Dodge/MBZ Sprinter chassis that has a diesel engine.
Winnebago maes a Navion and a View, but they don't very cheaply. By now, there should be others out there by other manufacturers.
You might be lucky to find one from an estate or older couple who no longer have the ability to enjoy the RV life style.
Good luck on your search--but don't mistakenly fall in love with the first one that you happen to find.