Our family car is a kei minivan (microvan?) with power sliding doors (=heavy) and everything. No trouble going up long or steep hills in windy mountain roads w

Our family car is a kei minivan (microvan?) with power sliding doors (=heavy) and everything. No trouble going up long or steep hills in windy mountain roads with the whole family of 4+luggage in the car. No trouble going up long hills at highway speed (120 km/h) with two adult friends in the back. Aircon on and everything. Works great.