To followup, the speakers arrived and are installed. Pioneer TS-A6966R's in the doors and Kicker KS's in the dash. Note these are not the "shallow" Pioneer 6x9's that Crutchfield recommends for our RAM's due to the front door, but the next series up. They are shallower than say the Kicker KS 6x9's but deeper than the specific shallow mount speaker Pioneer offers...if that makes sense. So they fit without spacers, but it's close.
Anyway, short version, they sound OK. Not an earth shattering difference, to be honest. Better, yes. Reality is I only spent about $100 for all six speakers so can't expect too much, but... well I'm on the fence. I actually installed the 6x9's first as the 3.5's were coming today, so I was able to hear the setup with stock dash speakers, and then again after installing the Kicker KS 3.5's. As most have noted, the Kickers can overwhelm the rest of the speakers due to being 4ohm instead of 8ohm, but a couple ticks to the rear on the Fader fixed that right up.
A side note, those front 3.5 forward screws are pesky. Having this -
https://www.sears.com/craftsman-3-pc-socket-cap-set/p-00943303000P or something similar made it much easier to deal with.\
And, oddly enough, on the rear doors I was missing one torx screw/base on each door, in the same location on both. It didn't look like anyone had been in the doors before, but who knows. Just seemed odd that it missing from the same location on both doors. I'm sure I can find some replacements, but the whole setup is kinda rinky-dink, I may look to see if there is anything else that will work better.
I also put the tweeter and logo "up", which now that I am thinking about it might be a mistake, as this puts the wiring connectors on top, where they are more exposed to the elements should any water get past the windows seals, etc.
So, thinking I might should have gone with Kickers KS's all around, but at $70 vs $200+, I figured I would try the Pioneers first. I can always return them to Amazon, but I'll roll with them for a bit and see how they settle in. I just don't know that spending another $125 on KS 6x9's would make any difference, since I am keeping the RA4 head unit?