hsmith,
I thought that TDR rally was a great event. I have often wished someone would set a date and advertise another one. I'd be among the first to pay my registation fees and attend. A second one was held that I attended a year or so later and then another one that I missed. I think interest dwindled after that.
The greatest one in my experience with TDR was held in summer of 2002 just before the Gen III trucks and HPCR engine were released. The event was arranged and coordinated by Robert and Robin Patton working with Cummins MREP in Columbus, IN. It was a great experience. I wish we could have one every year but events like that requirea a lot of money to be spent, a tremendous amount of work has to be done, and vendors have to travel long distances at great expense. Oh well.