need ideas for sound deadening material for suburban bed

[66mustangguy]

need ideas for sound deadening material for suburban bed.

got a 71 suburban with some load exhaust. making it the wifes daily driver to save money and need some ideas what would be good to put down on the bed (wood floor) that can be removed later in case I need to do some work. I have used dynomat in the past in my car, but that stuff once on is a nightmare if you need to remove.

I am also curious what others have done for carpet back there?

thanks