It’s totally OK to admit that you want one of those huge electromagnetic cranes that you usually see in scrap yards for yourself. And why making an electromagnet that can fling around cars is not easy, making one from scrapped parts of microwaves could satisfy your need for a powerful electromagnet.
The guys at “MakeItExtreme” strike again as they turn a couple of microwave oven transformers into a wall-climbing rig. Their website mention that the magnet is powered off a 24V 15A power supply with additional battery pack in case of failure.
They have managed to lift 200kg with their electromagnet so far and it looks pretty cool to have such an addition to a shop that is already packed with various builds. Check out how they did it!