I got my sound and heat/cool insulation from JC Whitney, cheap and effective. I completely gutted the interioir, removed smelly carpets etc, then Herculined the complete tub, including the door interiors. Then, with all the panels off throughout the truck, i used the sound insulation, followed by the jute mat type insulation everywhere but the floors. The floors got some removable mat insulation, covered with thick rubber mats, also removable, cut from my old pickup factory bed mat. Very thick and sturdy, washable, and really helps quiet it down inside. NO problems with wind leakage or cooling or heating. But it's a tintop.