[MAC71]

Coboyle...

I have two layers of 1/4 in heat/sound insulation on the floor and sides of the truck. There is 1/4 in of foam type insulation on the roof that was there when I got the truck. Living farther up north in Maryland and VA area it was fin most of the year. Only a July and August was it hot in the back. Not unbearable hot but still hot.
In Texas for half the year its hot in the back. In the middle of the summer in Texas with no rear A/C it will be nice and cool in the front and about 100 degrees in the 3rd seat.
If you live in OR you might be ok with out the rear A/C. You will need a rear heat if you use the 3rd seat.