Design me a Product

Wanna design a man pulling food car , and its weight should be as less as can. Only per-cooked food stored here. Those should be always heated by water vapor & water will be heated by gas oven. From that gas cylinder another gas oven will placed at outside which can be used for fry,toss some food like sausage. nuts etc. Car should be open by two side at upper portion . Seller will be stand one side and buyer at one side. Attached some picture for help. The car will be pull by man, so weight should be less . Food weight approx 150 kg. Car's lower side (buyer) should be stored the food, lower side (seller) should be storage. Upper side for all side will fiber-glass. Left side will be a small water tank & tap and dustbin.