Rubber Floor Mat and what else?

[Ironhorse]

I'm sure this has been covered before but need to ask. My '71 4x4 is getting closer to coming out of the paint & body shop. Have no idea what is original floor covering other than the black rubber floormat. When I bought the truck there was't much of that left either. I have a repop floor mat for 4x4 with tails but what do I need to go under it as far as sound deadening, insulation, moisture barrier? Any suggestions ? Thanks in advance to all replies.