Canvasback, also, wrong forum channel, there is a WK2 one.
I bought a 2012 JGC and a Canvasback was in the back from the previous owner, it velcros to the factory carpet. If you have a high trim (mine was an Overland) with the hard chrome strips on the cargo floor, get the reinforced one so when you slide something heavy over it, it won't tear/wear.
OP: Are you asking for a rear cargo mat that starts all the way from the lift gate and goes forward over the folded down rear seats until it hits the back of the driver’s seat? That’s a long stretch. I have a moving blanket that does that for HD runs to carry topsoil, salt or bags of fertilizer.