How about a shorter diesel pusher?

barmcd wrote:
That one is probably okay since its front engined.

I don't think so. By the time you load the back, no amount of front weight can overcome the rear leverage. Let's face it, this little bus is designed for in-city shuttle service. Its short wheelbase serves well for enhanced low-speed maneuverability. Sure, you can venture into the 70 mph regime of the freeway, but you won't last long.
I owned 4 short-wheelbased front-engined Class A motorhomes. It wasn't until I bought a 34 footer (gas) with a 228" wheelbase that I started feeling the stability enhancement of short rear overhangs. And now, I drive one with a very long wheelbase, and short rear overhang. It's fun to drive, at any speed. It's got wonderful directional stability, besides its other attributes. Live and learn.