I'm guessing the for a RTR 12th to exist, it would have to be slapped together quickly and cheaply, as most RTR's are. You need to take some time to build these cars to get it right (the old 12l4 I had being a good example). What works for (selling) a slash may not work for a pan car. Some people wont stick with 12th due to the attention needed to precision. Pretty much weeds out the class over time and I think you get less hacking with 12th. Just my .02