2017 GMC/Chevy DEF tank!

I agree with Thermoguy. Tanks has been there for years. I have one now and was a little concerned about the tanks. After driving the truck for awhile I no longer have any concerns. If it was an issue it would be posted all over the chev/gm boards. It isn't an issue. The new 2017's have increased the tank since to add an extra 2 gals over the previous years.