Both a Class A and a 5er have their place
IF you park for long, long periods of time a 5ER will likely need new tires and wheel bearing re-pack when you get around to moving.. So will a Class A but you may need to add a major overhaul to that as the engine has rusted and sized up (OUCH).. That said I recently got to drive a class A (Workhorse Chevy 8.1) that had been sitting for years.. Even with old gasoline it ran like it did the day it was new.
Motor homes like to be driven from time to time.
Now: I'm in a class A.. I am going down the road in a downpour when I feel the need for a rest stop.. I AM NOT GOING TO GET WET. The poor guy with the 5er.. Soaked before he gets to either the 5'er's door or the "Facilities".
Class A: towing a car. about 8 MPG.. Same size 5er with a big pickup 8MPG
Car without A. Well my vintage car does about 25, some today 30-40
Pickup without trailer 16-20
Car is way easier to park at Wal*mart or Bi-lo or Kroger (Depending on state)
These are some of the things I thought about when I choose a class A over a 5er.
Oh. and when the engine in my A was killed by road hazard (Blew the engine) that spare vehicle was . Handy,.