Where will your truck spend most of its time? On the road? Towing? Or off road? If you're going to spend most of the time on the road with towing, then I would get custom springs made for the rear to support the extra weigh but still keep the stock height (and a body lift). If its off road with towing, then I would get a full suspension kit. The add-a-leafs can usually hold up well to some trailer towing. And if that doesn't meet you're likings, ditch the add-a-leafs and stock springs and get some made.