make sure you REALLY need a dually truck. otherwise its not worth it, they are not as capable off road/in the snow (most are 2wd), they generally get worse mileage and they really dont handle very well. plus buying new tires is gonna be even more expensive than just normal truck tires, because you need two more. its also more wear and tear on your brakes, and they will eat tires a little faster than a regular truck as well.
i personally do not see the need, i have a sierra 1500hd that i have towed a 7000lb 5th wheel trailer with no problem, and thats still pretty far away from its max. 5th wheel towing capacity. (on the ball hitch ive towed even heavier hay trailers, but for way shorter distances) unless you are going to be towing massive 5th wheel trailers, weighing more than 5-9,00lbs every day of the week, you dont need a dually truck.
i mean, if you just have money to blow or really think you need one, fucking go for it. then put stacks on it. i think they look cool as fuck with stacks all shined up and chromed out.