I used Peel & Seal as well, then overlaid that with reflectix. My 83 didn't have carpet, just the rubber mat, so I put that over the reflectix. It's a lot quieter(can actually hear the wind noise around the mirrors now). Carpet would probably further reduce the noise, but I don't like carpet on a truck that sees a lot of trail use.

Bob Garrett
83 Toy Pickup
95 FZJ80
Shawnee, KS