Possible solution
I faced same problem with my 2015 Tahoe. I removed the third seat. Just a handful of bolts to remove and I bought a WeatherTech pan that fits perfectly.
Seats are sitting in my garage awaiting some future trade-in.
Third row seat removal on 2017
Chevy seems to change the Tahoe/Suburban every 5 years. Since 2015 was the first year, you can expect the 2016, 2017, 2018 models to remain pretty much unchanged. The power third row seat can be easily taken out of the truck removed by removing a handful of...
I bought the WeatherTech floor pan for the Tahoe. It is designed to sit on top of the 3rd seat folded down; but with the seat removed, it fits the area perfectly. Of course the WeatherTech costs $100+ so a scrap piece of carpeting may work just fine.
2015 Tahoe third seat removal
The storage bin has two plastic bolts that hold it in place. Lift up the rubber mat inside the storage bin and you will see the plastic bolts. The wiring harness has one or two connectors, you can separate them apart using a small screwdriver to pop them open...
2015 Tahoe third seat removal
Here are two photos of the back of my 2015 Tahoe with the third seat removed.
One shows the holes in the carpeting/floorboard and the other shows the standard Weathertech plastic/rubber pan in place.
2015 Tahoe third seat
If you can find a third seat, it is easy to install ... 7 bolts into the floor pan, electric harness snaps together. I would think a third seat would be expensive to buy. If you are buying a used 2015 Tahoe, I thought the third seat was included in the purchase price...
Tahoe third seat removal
Before I removed the third seat I talked to the Head of the Service Dept at the local Chevy Dealership. He said that the Tahoe/Suburbans typically have a 5-year cycle for major changes. Since the 2015 Tahoe was the first year of the cycle, we have several more years...
Tahoe - third seat removal
Yes. There are several holes in the floor. A bit of caulk and a couple of layers of duct tape and they are closed up. The third seat can easily be re-installed when you go to sell or trade it in. I have the Weathertech floor pan back there now and it fits very well.
rear storage box
I assume you have already found this, but in the storage box under the soft rubber bottom liner are two hand screws. They will allow you to remove the plastic storage box without touching the third seat.
third seat removal was easy
Thanks to all the posts on removing the third seat on 2015 Tahoe. I found it easy to do. 7 15mm bolts hold it to the floor, tip the seat forward and disconnect the power cord, then lift it out. Did not separate the 60/40 seats ... makes it a little heavy, but...
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