2016, The only thing I have found is a 400w amp and harness from plugnplay in CT. They also offer some amp plug & play harnesses but I do not know how many harnesses and amps you can piggyback. Since I am only a standard cab I am just looking at their single amp to run the custom door set-up I have and have not looked any further. Keep me posted if you figure out a way to add multiples because I may add a sub down the road.

2016,
Look on e-bay for Plug N Play’s 400W total four channel amp with LOC. I had an issue with my 2017 standard cab not putting out a signal to the LOC but that was because the vehicle did not have rear speakers and the rear speaker function was not turned on. Since I know no one with forescan and my local dealer and one of the big dealers in Knoxville played dumb I fixed my issue by rewiring the LOC from the input side of the amp to the output side. I have my own custom 3 way system, see speaker forum, and put an eight inch Blaupunkt powered compact sub under the passenger seat. The final result is just what I was after. Unfortunately the compact amp does not have any gain control so my head unit Max’s out at about 9 on the volume so you need to have a sub that you can tailor to the amp output. The nice thing about the small Pioneer amp is that with 2 small pieces of foam on one edge it tie straps directly to the bottom of the metal brace that supports the head unit.