My previous 2 motorhomes were on the Sprinter chassi. Mercedes is very strict on what RV manufacturers can do to the chassis, they won't even allow drilling holes or even welding on the frame. As a result the motorhome has to be designed to fit the chassis. The manufacturers take the Ford and cut the frames, cut sheet metal lengthen wheel bases, weld where ever they want with no regard as to what they're doing to the integrity of the chassis, I can't run my PC over 60 mph because I have a hum and vibration in the rear end. I've rebalanced tires, had the drive shaft balanced, it wasn't out of balance. I had a heavy duty truck repair shop look at it, he said the cutting and lengthening of my frame was the worst he'd ever seen. He said it didn't look strong enough to drive. This whole thing is a just a big expensive mess.