I just bought some more 7" screens for my van. Five to be exact and am thinking of two more 17 " screens to put in the side doors to round it out to ten. Two will be on the sun visors, one on the rear view mirror two one the dash one in a console That will give me 3 17" screens, one 32" screen and six 7" inch screens. One of the screens is for a back up camera and one for a navigation unit and the rest will be hooked up to the DVD player. I may have to add more batteries and if I do I think I will take out the two Optimas and install either 4 or six six volt batteries. I also am adding a 25 farad capacitor.