No idea. I'd start at Crutchfield or your local car audio shop and see what they can do.
If it were me, I'd have bought a bench truck to start and then have done the GM Kicker upgrade if I wanted more sound.
I dont think you will be able to. That sub is designed to fit under the full console.
You'll have to go aftermarket and get a bypass harness and do an amp/sub under the rear seats.
Dealer oil changes are a marketing ploy. You hang out in the showrooms, wander the lots and look at the new trucks/autos all the while the service dept. looks for something they can up-sell to the customer. GM dealers call it a multi-point inspection.
They have a vested interest in having you come back again and again and again. Think about it, how many want you to keep driving your vehicle? You are the only one; the dealers want to sell you a new truck and every time you are there, they get another chance.
i would say it is someone who bought a deisel and shouldn't have, they arenot meant to put around town or excessive idling. the brake thing is a gm problem, some do worse and some do bettter. i put 140k on my 2014 and was expecting the same on the 2020 but only got half of that mileage. a2020 with40k is not that many miles, my 2020 has 120k
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