21 foot Class A with Diesel? Does it exist?

Not to get off your point, but if you like the 21 foot size, why would you want to change to a class A? If that was the size I wanted, I can think of many reasons to stay with the Class C over the A. The first reason is I love that front overhang covering the windshield during the summer. Yeah, it may restrict the view a little, but it keeps the windshield in the shade almost all the time and keeps the sun out of your eyes. I'd also love to be able to step in and out of a drivers door. For what you're talking about the only advantage I see to a Class A for you is you sit up higher so the view of the road is a little nicer (but I don't know if a 21' A would be that high). And even though the sun can be a pain, you do get to see a lot of the Country out of that big front window. I doubt too many of the Small Class A's come with diesel engines and most will also have the engine in the front too.