Agreed with Michael. That's the regiment I'm following, as well. In fact, I skipped polishing all together this time since its a pretty new car and didn't need it.
You should be able to apply and remove the PS in less than an hour, and the HGG will give you the protection boost and added shine for months.
Something else to factor in is cost. While awesome, HGG is not the cheapest product, and with the size of your new truck, you'll probably go through it pretty quick. By having the PS base, though, you may be able to extend the life of your supply because you won't feel as compelled to apply it religiously. Something you may be thankful for in the winter months.