yea the RTD or MPVI2 is not "locked" to a single vehicle.
MY reasoning for going MPVI2 over RTD, and its not related to this vehicle, HP Tuners, Adam/ZFG, etc... is that I got screwed on a tune a few years ago(shit tune from a "well known" tuner who then ignored my complaints, had a huge meltdown a few months later, and went AWOL from the whole scene and I think never resurfaced) and I had to have the car completely retuned and spent another 600 bucks(4 more credits, dyno time, tuner time, etc...)... where if I had had my own MPVI2(might have only been the MPVI at the time) I would have owned all my shit, my new tuner could have simply pulled the tune using my MPVI2, re-worked it, and I wouldnt have been out more credits. Now this had more to do with I didnt own ANY tuning device so my credits, that i had paid for, were basically locked and associated with the original tuners MPVI device. So likely an RTD, for me, would have also been fine as my credits would have been associated with the device that I owned. I have zero desire to do my own tuning. I look at all that stuff and have no clue what I am looking at. Im a wrench turner. I believe any tuner that pays the appropriate HP tuners fees, can write RTD tunes, edit RTD tunes, etc... Im not sure every tuner pays for that functionality though, if its even an added cost. But if it is I could see a lot of guys who DONT remote tune, not pay for that service or ability. So for me, at the end of the day, the MPVI2 provided ME with a little more flexibility/peace of mind that the tune I pay for is really mine...again not that I have a single desire to change a tune that a pro sets up.