I was curious if anyone has upgraded their sound system, in particular their tower speakers. I was wanting to add 4 speakers and replace my existing 2 speakers on my tower. I was also wanting to add a light bar as well. My only concern is making sure I don't add too much weight to potential cause structural damage to tower, especially under the stress of towing a wakeboarder. I was wanting to put some subs up there, but the subs weight 30lbs each. Anyone know what the suspended weight limited on tower is?