Our 2023 Thor Quantum KW29 Class C motorhome is on a Ford E-450 chassis. It has the new monster V8, that has replaced the old V10 motor. It's a beast of a motor, with lots of low end torque, and has improved fuel economy over the old power plant. It is very noisy on start up. I didn't touch the throttle. It roars to life under acceleration, but then gets quiet once at a cruising speed.
