Everywhere but the front doors and roof is getting a layer of Fatmat followed by mass loaded vinyl from SecondSkin. The MLV is super heavy/ dense, which is why I didn’t put it on the roof. Seems more likely to hold water too, which is why it didn’t go in the doors. Fatmat takes the panel vibration out, MLV provides the sound/ temperature insulation. Lots of info out there on this stuff, decoupling layers, etc. It’s dumb, ha. Should be nice and quiet!