Towing with a 31' Class C, frame questions

Thanks for the replies, I had not intended to use a drawbar, just the standard hitch into the receiver. I figure I'm pretty close to what the tow rating is now, and with the frame reinforcement I should be good to go. I know the drivetrain will handle it, just want to make sure I don't start yanking stuff off the walls inside. The PO towed 3000#'s on a car dolly for thousands of miles with no ill affects, I just want to make sure I do everything I can to make it as strong as possible.

The frame needs to be inspected. If the coach people used a standard butt weld for extension, it needs to have reinforcing plates added.
That is a lot of weight to be added. It will take weight off the front end. You may need to get an equalizing hitch.

Frame Stretching (wheelbase) and Extending (rear overhang) used to be an ad-hoc thing, done on the whim of the coach builders. But for years now, they are following standards published by Ford. And those standards preserve the OEM rating of the CHASSIS.

That said, the amount of rear overhang in a 31 ft Class C is a LOT. In our case it's 10-11 feet and our wheelbase is 218 inches. That means it may not be a good thing to apply 500 pounds of hitch ball weight.

I think that what the 5000 and 7500 pound hitches offer, in addition to heavier material, is more "bearing" onto the frame. And maybe additional bolts, spacers and backing plates.

Please be sure to NOT extend the Drawbar. The rating is based on a standard length "ball mount" or whatever you call it. Lengthening it or using a Lift/Drop adapter weakens the system.