Just picked up a 2016 Chevrolet Suburban LT. This should also apply for the 2015 as well since it's the same design.
The good news is the width and length of the rear cargo area is the same (4'x8'). The not so good news is the height of the opening into the back has been reduced by 4". The third row seat is now bolted to the floor (non-removable). So, to make the loading area flat, they added this plastic wedge shaped storage bin that's as high as the folded up third row seats. This makes the effective load height right at 32" to get it into the rear cargo area. The problem is getting it in the opening. Once inside, there is 36" of height from the headliner to the loading floor.
Luckily you can remove this storage bin by lifting out the liner and removing the two large bolts holding it to the floor. This gives you 36" of clearance to get the game into the back area, but the third row seat is at 36" from the opening; so you'll have to lift the game up on the top of the folder rear seats and push the game in. You could unbolt and remove the rear seats from the floor but it's not something you'd want to do with any regularity.
Leaving the storage bin in place is not an issue with most standard DMD games I've measured most at 29" folded up. But games like Safecracker and Banzai Run will have to have the rear cargo tray removed as they are too tall (SC at 32.5") to get into the opening.
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