Making the change from diesel back to gas 2014 Itasca

We own a 2012 Winnebago 32K and pull a CRV road. Even on the worst grades we've encountered never has the speed dropped below 50 MPH. The key isn't the hp but the gearing. The winny has the 5 speed torqshift, which blows away my older 2005 Excursion with the 4R100 4 speed.

WRT engine noise, Winny does a great job with sound insulation and even at 4000 rpm, the noise is not to the point my wife and I can't converse in a normal tone of voice. At cruising speed, quiet as a mouse.