As someone with an EC950 on a similar but long bed 3500 Chevy I sure wouldn’t want it on a short bed. At the very least the known weak spot with these and many slide models is the frame under the slide. Ours has a small sag to it. The 2004 vintage of bigger brother 1150’s would crack frame welds back there. That could only be made worse with that much more camper hanging unsupported off the back of the bed.
It’s about 4000 lbs loaded with a battery, LP, water an average amount of “stuff”. Regarding the thread title: the CG is roughly over the rear axle as the front axle weight didn’t change much if at all if I remember correctly. A short bed would definitely unload the front and overload the rear axle even more.