another thing to consider would be gutting your interior, and using some type of spray in or roll in truck bedliner (multiple coats) then just put your interior all back in. it will kill road noise big time. this is kind of a time consuming procedure and the smell will be strong for a week or so after you do it.

also where you have body panels that are hollow or have hollow cavities you can stuff a hefty bag in there and then take expanding foam and spray it in there. once the foam dries, pull it out, peel off the trash bag and you have a form fit foam sound deadening device. if you cant get the foam back out to pull the bag off you can always just leave the bag on there and just cut the excess off.

Hunter