whiz,
I looks like you're the opposite of this thread's title - you're Underweight FULL!
We have an ~24 foot Itasca on an E450 chassis that is REALLY underweight at any fullness we can load it up to. We're around 11,800 - 12,000 fully loaded, but the chassis can take up to 14,050 lbs.. That's exactly what we wanted when we bought it -> chassis overkill.
Enjoy you great smooth ride! It took several years before we finally were able to eliminate a lot of the sting out of the rear of our rig using specific shock absorbers that weren't even available for the Ford E350/E450 chassis until many years after we had bought our Class C.