Pay attention to "She who must be obeyed". We picked up our current 5er at a very favourable price because somebody broke that rule & bought it without telling her AT ALL.
For many reasons we went with a 5er. It is very much a couples above middle market 5er, not a family friendly one. The model was chosen for its dry camping capabilities such as a large water capacity, 100gal, & lots of galley space plus other reasons.
10 years & over 1500 nights on the road later, no regrets on choice of RV type or model. Lots of people cite parking a 3500 dually at the store as a negative. A non issue as far as we are concerned. Parking a few seconds more away from the door is not a big deal. Stopping to use the head at a convenient spot is no big deal either. Have not seen a class A driver use the head while underway yet. When our truck is in for maintenance we still have a home to live in.
Then there is the cost & depreciation rate of a class A vs a 5er. A whole nuther issue.