Diesel --- front engine -vs- rear engine

Maybe I should be a little more clear in the first part of my post. There was a specific class A chassis called a FRED. That was the glorified gas chassis with a diesel engine. Unfortunately the term FRED has become generic to mean anything with a diesel mounted in the front. I believe FRED was actually trade marked, so when using the term FRED, it should only refer to the glorified gas chassis with a diesel engine. The term should not be used for anything else, such as the Kodiak class or the semi-truck conversions. Those are a whole different ball game.