Most Class C motorhome frames don’t go to the rear of the rig. They have extensions that are lighter and not great for attaching a hitch with a trailer that heavy on it. You can tweak the rear of the motorhome.
The hitch will be a good ten feet behind the axle, maybe more. Bad for handling.
I’ve towed a 10,000 trailer behind two Class As, a 25’ and a 26’, and that’s why I now use a diesel dually pickup and camper. They handled way too poorly, even with all the add-ons, weight distributing hitches, sway bars, extra springs, air bags.... sometimes a bad combo is just a bad combo.