I am newbee to Class "C" motor-homes as an owner. So, I am taking the time to understand some of it's limitation's. My normal driving speed when towing is 60 mph in the far right hand lane. Those RV'ers that pass me going 70-80 mph towing make me wonder. If I have a front tire blow-out, 60 mph is all I want to be going. If another driver has a problem 60 mph is the maximum speed I want to be at to take corrective action.
Ford E450 has a GVWR of 14,500 lbs
This is the RV loaded with all cargo, fuel, water, passengers etc.
Ford E450 has a GCWR of 22,000 lbs
This is the RV loaded weight, plus your tow vehicles weight and it's cargo. This means your tow vehicle and it's cargo could be 7,500 lbs. But there is one big problem the hitch on the motor-home is only rated at 5,000 lbs.
My Blue-ox tow bar is rated at 10,000 lbs which came off my Class "A".
I understand the Ford E450 can handle without any problem a 7,500 lb tow. There are people already towing 7,000 lb enclosed trailers with the 5,000 lb rated hitch.
The Forest River Factory rep states they have done tests on an upgraded 7,500 lb hitch. The only thing that failed was the safety chain eyes on the hitch.
The curb weight of my 2009 Toyoda Tacoma pickup is just over 3,800 lbs but its GVWR is 5,300 lbs. An electronic brake system pushes a brake pedal cylinder under the dash.