Should I run my channel to the 4 speakers or 2 to front, 2 bridged to amp in acss cab

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Hows that for a title?
I have some older MB Quart comps for the front, and some Mercury Hi-Fonics for the rear (Coax), and a 12" sub for the rear. I have a 4 channel amp now, and it has enough power to push that sub with 2 channels bridged. Will it be enough in an access cab to only power the front speakers, and just do the rear off the head unit? I could save up, get a mono amp, and run it that way as well... I would have to fight my wife though, since she says I've spent enough on the system for now! lol
Oh yeah, I have a Kenwood Excelon head unit.

Sorry if this as been posted before... I could not find it with the search!
Thanks for any help!
Adam

 

runs the rears off deck power
run the fronts and your sub off the 4 channel amp

 

Skip the rears, run the fronts and sub off of the amp. IF you need more rear fill, then run the rears off the HU. Quality before quantity

 

Agreed.

I only run front speakers. I run my components off the front channels and the sub off the back channels bridged.

 

Thanks everyone!
Especially you Hookedontronics- The rings are great!

 

I was just about to go and buy another amp!