For every doom and gloom naysayer there are quite likely 10 people who have been rving/camping for years with no major problems, and haven't bragged about it.
We have never owned a diesel motorhome. We have had a Class A with Dodge 440 engine, a Class A with a GM 454 engine, a Class C with a Ford 460 engine, and now our Class A with the Ford V10.
We towed either Jeeps or a Dodge 1500 behind most of them (the 454 engined one didn't have a hitch).
IMO, forget about how many can sleep in it, what is important is where you are going to put them on a rainy day!