Draft or Trade Down

In this draft we really need some DL and OL. There are a ton of good DT - some of the guys marked as Day 2 prospects would be Day 1 last year or other years - and DE and we need a Guard more than a tackle. Therefore, it might make a lot of sense to trade back. If we could move back and get a couple extra picks in the first 3 rounds this would be best case for us. It is also possible we take an OT like Campbell or Banks at 9 and move Penning to Guard; so there is a scenerio where I see us using the pick.
Campbell looking like a better guard than tackle from what I have read an heard