Hi All, I'm looking at the new Regular cabs, and was wondering if anyone has added rear speakers to these trucks. My 2018 has the (real) premium sound: six speakers, front/back/r/l balance, and sound presets (Rock, Country, Jazz, Talk, etc). The newer trucks just have a mono 2 speaker stereo with little control (Bass, Treble, Midrange)...and no l/r balance. I commute back and fourth, and I'm worried this radio will drive me nuts after having a good sound system.