Back then, they were often one and the same. We used a J20 Honcho to pull our class 3 CJ 7 around to races. That same J20 pre ran dozens of SCORE/HDRA races, and chased on race day. The poor truck was constantly used and abused!Yeah, but still a huge difference between a trailer puller and a chase truck. Might as well be a lowered dually at this point!