That is a thought... and I am going to do something. I am replacing the pad, as it got pretty nasty with the spilled food. I will be adding a little more insulation while I'm at it.
As requested... here are some detailed pics of the gutted rear seat/cargo area.
Yeah, I know all about Dynamat. Its kind of expensive for my needs. I don't need crazy sound deadening, but I wouldn't mind a little. I don't have a crazy sounds system anymore... with panels rattling and such. So some cheaper insulation will be fine for me.