We bought our 1st class A in 1993 and after 2 more A's, we sold our 40' Allegro Bus almost 2 years ago. We replaced the Bus with a 2012 Winnebago Class B ERA. We now have 23,000 miles on the ERA and are really happy with our downsize. Nothing like 3 times the fuel milage and the ability to go from coast to coast with or without a TOAD. When we want to take a car, we tow our 2007 Mini S 6 speed and enjoy the heck out of driving it when we reach our destinations.
We do not regret our decision for a second, as it was exactly what we needed to do at this point in our life. The ERA has met or surpassed out expectations and the class B lifestyle has been liberating to say the least!
PS- if you get rid of all the stuff you seldom or never use, YES- you can get everything you need into a class B. Packing with some common sense and thought will work and you'll appreciate the simpler life style.