Reading your last post Roth my mind made the jump that the retro-fit TPMS market definitely exists albeit relatively small in relation to cars in existence. I believe that TRT's is not good for retro-fit simply as it is relatively difficult to do it compared to stick something in th evalve stem and transmitting to a cab mounted receiver.
Some flash cars do have them fitted as standard - and I have not the time to work my way through all the manufacturers to see what they are using. However I suspect they are fitted as commercial one upmanship and the cost relative to the car is insignificant.
TRT's product is, to my mind, really beneficial to being fitted on the production line where all wiring etc can be easily put in place. As an auto assembler with a roll out program to come for TREAD I can work it into my new cars as I go through the product cycle. I still have no problems - other than I would like an RNS : )
Re 2003. From the point of view that there would be an established market for TPMS that is good. I accept that new better technology does not necessarily win and that TRT being around in 2006 and working would not necessarily displace incumbent products UNLESS it was more robust,cheaper and easier to fit. But as this is likely true then it would have been worked into the 2006 product cycle. From an auto makers point of view cheaper to them and something to boast about in the blurb .....
I have read virtually everything ever printed , and referred to on the board, and it is filed away into sub-conscious sorting so I cannot point to any specific thing. What would be interesting I suspect is if someone is knowledgeable as to the assembley line procedures and timing of changes for the US auto industry. And what/which cars are using TPMS wise at the moment. : )