Here is an easier question to answer and to post in public:

The Good Fairy will give you AWESOME gas mileage forever AND grant you THREE (and only three) wishes for your RV. What would your three RV wishes be? List three things you would add, change or improve to attain your dream RV. 

1. More horsepower/torque (remember no-sweat on gas)
2. Twice the interior room that stores in a smaller space (ha).
3. Better ride.

Oh lets see....
1. Better ride.
2. More room in the cab area and much more sound insulation.
3. More exterior storage.
4. better mattresses