Alot of new cars run 19s, the Audi RS6, some new Porsche's have them etc and they all have over 400bhp so the Supra is no different.
I bought these wheels, then sold them with my old car but then bought them back because i love them and think they look great on the Supra. I had a chance to walk away and buy 18s but chose not to, that must tell you that 19s are fine if you have the right size, offset etc.
As for RLTC, i wouldn't mind a go in a Supra with it, but as i said if you push your car to the extreme where it's looking as if your going to loose it then whatever TC you have makes no difference as your away anyway.
Just my opinion of course, if you want to go 5mph faster in the rain then by all means RLTC sounds great, but i bet seriously nobodys noticed anything different from the stock TC in the wet.
Bye for now
Paul