Why not gasser rear enging?

A lot of good comments here on this topic. My opinion would be that an engine in the rear would run at the same relative temperature whether it is gas or diesel powered. Cooling issues are dealt with as part of the design process. Weight placement is the same way. Gas or diesel is irrelevant if it's designed in. It's part of the engineering of the motorhome. Didn't John Deere build some gas powered rear engine chassis a few years ago? I seem to recall seeing some but I don't recall who built the coach that was on it. I think it would be a great thing. I'm still not completely sold that the price difference between gas and diesel powered coaches is really worth it. Anybody else know of any rear engine gas powered models.
Might be something to look into if the urge to trade ever strikes me.
Hope all is well back there.
Ken