" It’s always made me kind of nervous that the whole show is running off one shared line" that truck has lived it's life for 50 years with that setup. it worked fine for what it was designed for at it's and how vehicles were driven. It depends on what you want to do with the truck and how you are going to frive. if you are going to uprade the power and drive it in todays hurry up offensive style in heavy traffic then I would make sure to upgrade the system.
ron