the bx1205d would do fine with type rs and i have seen the bench at 14.5 volts and it did 1113 watts at 1 ohm you wont see it if you have all stock electrical but it would still work well for the type rs
What does it matter what voltage the amp is rated at, it uses a regulated power supply, which means it does the same wattage whether at 12 or 14 volts.