How deep are you into this sound system you have and what is the goal here? Personally I like my tunes on occasion.. and hate it tinny or rattling.. when I turn it on it needs to return the favor! "Gotta hear more Cow Bell" ya know what I mean? This can take a little work and research so everything matches up. I had a Audio formz roof on my Maverick and loved it.. would have done it on my Krx if I hadn't of got a roof with one of the package's.. The factory stereo option is turn key and a nice fit.. I didn't like giving up my dash for it though and like it overhead. There are several aftermarket options out there that you can get a very nice sound system without turning your krx into an overpriced rolling Boom Box! The other thing to consider is the elements... your going to have dust, dirt, and mud in and on the system and your going to have to wash it down..
If you're putting on a rear window to limit the dust in the cab.. that's a whole other issue, adding a rear window by itself will only partly resolve it. That along with fender flairs, mud flaps, insulation on the floor and console, and vented front glass.. that combo will clean up your cab.