Dealer add-ons that they will not remove are not uncommon. Just depends on how bad you want the truck. If not you, the next person will come in and pay for them. Especially in this tight market.
Person that owns 3 of the 4 new car lots in my town plus 4 more in a 15 mile radius adds $799 paint/interior protection on every vehicle. They will not even order one for you without it. To beat it all, they only warranty the protection for 12 months. If you want to buy from him, you take it. And considering he is one of the largest Chevrolet dealers in the state, a lot of people do. (Not me, the last 3 trucks I have bought have been at least 125 miles away to avoid add-ons.)
At least it didn’t have the biggest ripoff, $99 nitrogen tire fill.
If you really like the truck, just consider it has a $1200 option on it that you would not have ordered, but for a lot vehicle you suck it up and take it anyway. Most people do that all the time.
My 2 cents.