The Low Loader driver has to be able to demonstrate competence in operating all the listed machines for the activities they undertake with the machines. This does not mean they need to be competent in all aspects of the machines operation but certainly in terms of being able to load and offload the machines, after all this is a potentially high risk activity. Some of the larger plant is often wider than the standard trailer and sits on outriggers, this leaves no room for error during loading. If anything the Low Loader driver probably needs to demonstrate much more sensitivity of control, maintainence of stability, and all round deftness to get the vehicles on and off safely. There are plenty of unpleasant pictures on the internet showing the very serious consequences of getting it wrong. An individual course for each type of machine is the only real way forward as each machine has very different handling characteristics and operational controls.