AlGo...Welcome to iRV2!
I am sure you will find all sorts of info along with helpful fellow RVers here.
I can tell you that years ago..we had Banks on both our Bounders and it worked well for overall mileage and performance increase...but again...that was years ago...
May I also suggest that you venture into the Winnebago forum?
You can find many people there with other modifications similar to what you are contemplating.
Good luck with your project whichever way you go.