Power Output 104 watts RMS x 4 channel at 4 ohms
and ≤ 1% THD + N

284 watts RMS x 2 channel at 4 ohms,

14.4V supply and ≤1% THD + N

The output provided here is peak right? So I take it normal output is 52w watts RMS x 4ch @ 4ohms.
So what speaker you matching this amp with? If possible like to know the speaker spec.

To my POV, alternator doesn't consistently hit
14.4v.typically it fluctuates between 12-13v.

So this amp gonna use on 4 component speaker or 2 component speaker and woofer(1 or 2)?