They are not usually "needed" to restore or refurbish an old truck. But we all have things we didn't "need". We can not reveal that to "she who must be obeyed". An angle grinder, die grinders, burrs , needlers,, drill press can handle the average work we do. If you have projects/hobbies that need thick plate cut in fancy shapes, a plasma cutter is perfect. They ARE pricey. As said, you want dual voltage and you want pilot arc/no touch. You will need a good air compressor.
The third world cuts thick metal with an arc welder.
You can make fairly good cuts with a torch also.