Light Bar & DVD Questions

Hi Forum - I have two questions about H2 customizing:

1. I want to order the light bar for the top of the H2 - I already have the grille mount lights. The dealer told me that I can only operate two of the four top lights if I have the two grille lights. Is this true and if so why?

2. What is the average cost to install a DVD player with two monitors (located in head rest of fronts seats - I have a sunroof--is there any other location with sunroof).

Thanks

Tucson Beast