Suggestion about your Sound system.
Instead of using two, 2 channel power amps you could use one 4 channel power amp.
Configure the 2 front channels to run full range or midrange and high frequencies.
Configure the 2 rear channels into 1 mono (L/R bridged) channel to run low frequencies (subwoofer).
If your head unit has subwoofer pre-amp outputs, the low frequencies and gain can be controlled from the head unit.
The head units subwoofer pre-amp outputs are connected to the 1 mono (L/R bridged) channel amp inputs.
Most multichannel amps also have gain and frequencies control built into the amp. Check 2nd pic
It really doesn't matter what 2 channels are bridged mono, front or rear.
By do it this way, you only need to mount one amp, (one amp uses less space), power amp power and line level wiring is reduced.
And less ground loops and alternator noise in the sound system.
Tip: if possible connect all sound system power and grounds coming from one single point.
i.e. grounds from head unit and power amp should be connected to the chassis at the same location.
Same should be done with head unit and power amp power connections.
Personally myself, I like listening to the truck when I drive, that way I can hear if something goes bang and breaks.
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