skyerunner wrote:hberdan - did you ever end up doing this? I've been thinking about this as well as adding some padding as I often end up sleeping back there in my line of work (i.e. ski/climbing bum...

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OK, I went over to McGuckins Hardware and bought 4 linear feet of 36" wide vinyl/rubber (nt sure) ribbed floor runner--you know, the stuff used for kitchen floor mats/stair runners--it's sold right from the roll.
I cut it to fit the trunk area floor, but didn't fit any to the back of the rear seat.
To make it work, I placed it in the back of the car and used a yellow marker crayon to outline the contour cuts needed for the wheel and tool wells, etc.--carefully trimmed it with sharp scissors--looks good. Gives me a place to put wet ski boots, etc. I didn't glue or tape it in place, it's lying on top of the original carpet.
Stuff was about $5 or $6 a linear foot.
If my factory carpet was really rotten, I'd think about replacing everything with some nice but thin indoor outdoor carpet, which could be had for cheap at a carpet remnant store. The big problem appears to be that most carpeting is too thick to allow the rear seat to fold up and lock, if you install it on the rear of the seat.
You know, if you're sleeping back there, you should just remove the rear seats entirely and build some kind of platform that would allow a level sleeping surface--would give more carrying room as well.
"I'm high on the real thing: Powerful gasoline, a clean windshield, and a shoeshine."