I have a home build off-road caravan with an aluminum roof that need a lift system. I use to lift it from the inside with my back. But at 63 it is not possible any more. I am looking for air lift or elect linear. Need to lift ±750 mm. I install 4 x gas struts on the outside. It helps but do not lift the roof. And if I install stronger struts, it is difficult to take it down. Any suggestions please.