Ideally yes! Needless to say putting a decent lock will help but the best thing you can do is use a container with a lock box installed. If it doesn't have one then you can buy them and weld them on or buy the ABUS container lock system which comes with a box that you bolt on. Below is a photo of a lock box showing a straight shackled lock up inside the box. To cut that lock off would be a huge task and it makes a fairly average lock, hugely secure!