All ISO shipping containers Have a very locking mechanism for that finish doors, usually fastened with a padlock. Heavier cargo door locks, which look somewhat just like a large wheel clamp made of steel, is usually additional For extra stability. Insulating paint might also add another degree of protection to https://shippingcontainersupply.com.au/product/33x40ft-10x12m-quicklock-commercial-grade-dome-shelter/