Typically in an RV you wouldn't care about HP, it is torque that turns the wheels, not HP. The difference between 468ft-lbs and 475ft-lbs is a rounding error. They may have 'de-tuned' the engine for RV usage as the typical duty cycle for a truck/car is probably in the 20% range, RV 30-40%, Semi's would be 60-80%, marine likely 80-90%+. Those are only my guesstimates, don't hold me to them.