Right, you can shoot me down all you like for this but I've used my supermax 40 for years now broken down to a 25 for most my work. Its set up tubeless and is a doddle to add or remove sections. Like you mentioned Richard , I just bought an additional end cap.
If, however, I were to be working anywhere where there was a risk to myself I would buy an additional insulated base section or maybe avoid the risk altogether by not even taking the job on.
But I live on south coast. There are no trams or overhead power lines down here. It would be a complete waste of my money and just isn't needed.
Of course Gardiners are going to say you need to buy a new insulated base section. Not only will they earn from it but they need to cover themselves in the event of an accident and keep up their good responsible reputation. Use some common sense , evaluate the risk and decide for yourself.