If you planing to add a pop top roof in your beloved Transporter , why not to add a solar panel to make your live easier. With this panel you can top up you leisure battery and keep your fridge working while not draining you car battery. You will not be limited to hook ups anymore so you will have more choice of camping.
VW Transporter Pop Top Roof Solar Panel
VW Transoprter Pop Top Skyline Roof