I like mine... It may not be 100 percent accurate but i use it as a reference point. Song's bass notes are at different starting amplitudes. So say in one song the note might be at -3.3db and another song might be at -1.7 So your total unclipped volume is going to be different with different tracks. I have measured mine with the dd-1 and it seems pretty consistant.
Future is an artist that is blowing up because of the sound he makes; lyrically he can afford to be weak cause that is not what people that like his music are really listening for...
http://www.audiosavings.com/products/Car-Amplifiers/Hifonics-Brutus-BRZ1200.1D-1200-Watt-RMS-Class-D-Mono-Car-Amplifier-Amp-BRZ1200/BRZ1200.1D.aspx This was my first amp... definately does rated
Since you have that new of a truck and assuming that you are going to keep it and eventually upgrade your soundz, i would definatly recommend a aftermarket high output alt. Mechman would probably be your best bet.