Yeah I like the polk audio very much, my 6 speakers in ceiling I believe are 4 1/2 or 5 in (camper is stored on base storage lot for winter) and this is one of the first things I wanna do this spring before heading out.
I been looking at crutchfield at a couple nice head units so may give them a call abd see what techs say because when I called Keystone they were little help. I found this out the hard way when I called about satellite prep for bedroom...thats a whole other issue....
So my gameplan, 6 new indoor speakers, soundbar and passive sub (so I dont have to have dedicated power) new head unit that has passive sub hookups...I will use my portable Sirius unit to plug in nust have to figure how to run antenna if I want to make the antenna mount perminent. Then the head unit, just have to figure which one I will go with, and best bang for the buck without crazy mods or losing any functionality....