Bought a plastic mat for the Rodeo that does this... plastic mats velcro'd to the back of the 60/40 seats (which actually DO flip down to be totally flat), and large rubber mat for most of the back trunk area. It works well and does keep the carpet backs in decent shape.

I'd say it looks like a good idea... try it and shows us how it turns out. Only problem I have found with velcro is that it seems to get mighty hot in my VX when sitting for a while, and the sticky back to the velcro softens up and un-sticks most the time.