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With those pics you have up, plus the planned strobes and light sets, I think you're good to go. The reflective vinyl will make a big enough difference that bigger stickers won't be needed.
No! Don't do it... your truck looks bad in and of itself. That graphic is too big and it takes away from the coolness of the truck. If anything, put a smaller version of the rear glass sticker in a corner or something. Truck looks to good to mess it up like that.