Best Cargo mats
"Some" owners have used the folding MB system from the 1st generation GL - I don't have part# at hand - others have used the system from Canvasback - do a google for Canvasback cargo liners

Good Luck,
Steve
https://www.ebay.com/itm/Mercedes-Be...item1c8dd34a0f
the nice thing on this one is fold with the 3rd row seat if you need it, I use the same one since my GL450 2009 then keep the same liner in my GL550 2013, GL550 2015 GLS550 2018, yes, a GL's addicted here
https://www.ebay.com/itm/Mercedes-Be...GDytmH9gTND_lA




https://www.ebay.com/itm/1668140241-...72.m2749.l2649
Wanted a little more protection although the 3x5 commercial mats would have worked.
Jeff
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been very happy with it. It covers the back of the second row all the way to the tailgate. It has cutouts in all the right places, it covers the side arm rest and handles the split 3 row seat without a problem. I bought the optional rear hatch and bumper cover. I stopped at the back of the 2nd row but you can purchase covers for the back of the driver/passenger seats.It is not leather but the material doesn’t feel cheap and there was no initial smell problem. Initially, parts of the rear hatch kept detaching from the door but I just added a little bit more velco and the problem has not returned. Their website does not specifically state the GLS model but does show the GL. I contacted them and sent some pictures and they confirmed that everything would fit and it does. So far, I’m a happy customer and recommend them.
Had them for a week and will be returning them.







