[jburson250]

Kerswell . . . Great color choice! I've gotten many compliments on it over the months.
To improve my RF, I replaced the front door speakers with Polk db690 6x9's. The front speakers are an easy install. The rears are more complex - you'll need to come up with some sort of surround that moves the speakers inboard, away from the door frame and window (when in the down position). This surround is part of the rear door OEM speaker. In front it's a seperate piece. There are posts here on how to make them from particle board by bestatchess and others.
My db690's are 4 ohm speakers, the OEM's are 2 ohm. It made no difference. They sound great and integrated perfectly with the RF system. They made a noticible improvement. Please remember that speaker impedance is a factor of signal frequency. Frequency supplied to a speaker is constantly changing. There were posts here months ago insisting 4 ohm speakers would sound horrible if added to the RF. I have found those oinions untrue for my application.
The other inexpensive upgrade you can do yourself is to add polyfill to the OEM sub box. About a year ago I posted detailed info on how to do this. The original post (not by me) was titled "$1.57 Fix" or something like it. Search on "polyfill" and you'll find it.
Best of luck with your truck!