It is a 2003 Mits Montero Sport LTD. The doors don't seem different from the majority of what's out there. I have Dynamat Xtreme, both levels, plus acoustic damping pads throughout. Doesn't sound like I'm getting much resonation from the inside or outside skin. Did perform the ritualistic phase shifting on every speaker for optimization.
I think the midbass I'm after is going to require enclosed midbass drivers up front (probably on the floor at the front of the seats, firing forward or up). The stage, I'll try raising with a pair of tweets crossed over pretty high and positioned with a higher/forward focal, to draw it up.