Afternarket entertainment system

Hi,

We just bought a used 2000 Montana and we like to get an aftermarket dvd system for it. I thought it would be easy to install an overhead drop down unit, but this van has the rear climate and radio controls and those take up most of the center of the available ceiling area. The headrest type wont work because we have 3 kids and the kid in the 3rd row wouldn't be able to see the screen. What have other people used?

Thanks