2, cheaper 7feet to 20feet mini refrigerated van /mini cargo van for sale/delivery vans for sale for ckd kit Main Characters Light in weight: 40% lighter than metal body. Better insulation: K value less than 0.3w/m2k. High in strength and long life: 5 times longer than metal body. Non-corrosion, non-pollution, anti-brine, acid and soda-resisting.