If Rebels are currently coming off the line in the two tone scheme, that definitely throws a wrench into my theory. Maybe it is a delay on some sort of trim piece related only to the TRX two tones.
Additionally, if Rebels are currently coming off the line in the two tone scheme, it doesn't make since RAM would only produce black TRX. They would be switching colors with the rest of the 1500s.
I believe RAM would focus on the LE and other early orders if they could. There has to be a reason they are not.