The V-10 has been the same for a while now. In our pickups (F-250 and F-350) it wasn't that noisy but the engine in the pickups is way out in front away from the passengers.
In our Axis the front two people are pretty much sitting right on top of the V-10--very noisy. I had added some extra insulation to the doghouse and to the inside front compartment to quiet it down--we can now hear each other without having to shout.
The Quantum is a Class C with a Ford van front. I would suspect it will be a little bit quieter than our Axis.
If your 2004 Jayco is a Class C I would suspect that the Quantum will be as noisy or slightly less as it would be the same Ford front end (just a few years newer).
(I can't comment on roof materials as all of our RVs have always had a rubber roof--including the Axis past the front cap. Well I can say one thing: The fiberglass on the top of our front cap has seriously faded due to UV damage in the 3 years we've owned it. If the whole top was that I think I'd prefer the rubber roof!)
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