I had a 2015 Ram before my 2017 Denali and the factory Alpine system with that Ram was a great factory system in a North American truck. I had a 2013 F150 before the Ram and that Ford Sony system was really disappointing. As for the Bose system in the GM's , I'm on the same track as Bmz72... the Bose system could be always be improved but, it delivers crisp and clear audio with just enough bass, but I would like a bit more bass as well for my preference. While the GM Bose systems are not quite as good as the Alpine system in a Ram for bass and loudness, the clarity of the Bose system is pretty good and IMO better than the Ford and a cleaner overall sound than the Ram systems. If a clean rear sub plug and play option is available near you and not too pricey, I'd certainly add it on if you can.