I need to add some rear speakers to my 95 truck, which is a reg cab. I thought about either mounting some 4" or so external surface mount speakers somehow tucked into the rear cab corners, or even fiberglassing an enclosure into the corners.

What have you reg cab guys done? Anyone good with fiberglass? I've never done it before, but it looks like fun!

 

when i had my reg cab i had the 4'' dash speakers plus 6-1/2'' in the doors and a 8'' sub sounded ok