Your friend is right about the motor mounts. But everything is rubber isolated on vehicles. the body, the motor, possibly the gas tank... you have to "jump" all these rubber pads. Battery to motor, motor to cab, cab to frame, lights and tank sender to frame/body. All clean, shinny metal with toothed washers is required. Good braided ground cable is nice, heavy duty and max flex. Battery direct to a starter bolt is a good way to "start" out.
